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Makita B-51873 Flexible Impact Bit Holder, 12"

4.6 4.6 out of 5 stars 873 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice
Brand Makita
Item Length 12 Inches
Material Alloy Steel
Drive System Nutsetter
Finish Type Painted

About this item

  • Designed exclusively for high-torque impact drivers
  • Ergonomic grip for comfort
  • Convenient 12" length for those hard to reach places
  • High-quality steel engineered for use with impact drivers
  • Ideal for driving screws in a wide variety of heavy-duty fastening applications including deck building, framing and installing plywood subfloor
› See more product details

Customer ratings by feature

Easy to remove
4.8 4.8
Easy to use
4.8 4.8
Durability
4.5 4.5
Value for money
4.4 4.4
See all reviews

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Customer reviews

4.6 out of 5 stars
873 global ratings

Customers say

Customers like the build quality, functionality, and value of the fastener drive bit. They mention it's rated for heavier-duty applications, works well in an impact driver, and is well worth the purchase price. Some are also happy with the ease of access and hold. However, some customers disagree on its flexibility.

AI-generated from the text of customer reviews

Select to learn more
Build qualityFunctionalityValue for moneyEase of useEase of accessHoldEase of removalFlexibility
68 customers mention "Build quality"58 positive10 negative

Customers like the build quality of the fastener drive bit. They mention it's rated for heavier-duty applications and is a solid performer.

"This is one of those tools that is just a pleasure to use. It feels robust and just works...." Read more

"...It is pretty strong and doesn’t twist us like some of the cheaper models like these. The length is good. I do wish it blended for better flexibility...." Read more

"...In addition, it is far more robust than the other thing I was using...." Read more

"Good quality. Holds the bits well. Worked well for a furniture / desk that I had to dissemble, then move and reassemble...." Read more

42 customers mention "Functionality"40 positive2 negative

Customers like the functionality of the fastener drive bit. They mention it works well, is sturdier, and has proven to be very useful. Some say it works well for low torque and small drilling.

"...It feels robust and just works. I've used a few different flex shafts and this one is a keeper." Read more

"The strength of the magnet could be a lil better but it does work well...." Read more

"...This one is solid heavy and just works. It does have its limit, so just know how to use it...." Read more

"Good quality. Holds the bits well. Worked well for a furniture / desk that I had to dissemble, then move and reassemble...." Read more

15 customers mention "Value for money"12 positive3 negative

Customers appreciate the value of the fastener drive bit. They say it's well worth the purchase price.

"...Worth the money, I have a very cheap one that doesn't do nearly as well." Read more

"...Yeah, I'm diggin' it. Worth every penny." Read more

"...For me, it was well worth the purchase price; it paid for itself with the one job completed." Read more

"...My only gripe about this is it’s very expensive, at $35 it should be $10 less. But I guess you get what you pay for...." Read more

12 customers mention "Ease of use"9 positive3 negative

Customers find the fastener drive bit easy to use. They mention it's durable, convenient for everyday usage, and a pleasure to use.

"This is one of those tools that is just a pleasure to use. It feels robust and just works...." Read more

"Product is easy to use, Easy removal, put it through some decent abuse throughout the last 365 days strongly recommend" Read more

"...The one I purchased worked but was very difficult to use because (1) the bits do not lock into the end like it does in my impact driver, and (2)..." Read more

"...It has made every job SOOOOO much easier and faster. No more dealing with that one last hard-to-reach fastener...." Read more

11 customers mention "Ease of access"11 positive0 negative

Customers find the fastener drive bit useful for getting into tight spaces. They mention it's a good tool for both narrow reach spaces and odd angle spaces. Customers also appreciate how the bits fit in and feel stuck on it.

"...Good tool for both narrow reach spaces and odd angle spaces...." Read more

"Very happy with this. Works incredible. Love how the bits fit in and feels stuck on it...." Read more

"Works really well. Helped get in tight spots between the joists to secure them to my hangers...." Read more

"...the way it holds in a hex end bit as you can push and pull and it stays in nicely. Well made, durable, and worth the money as it isn't exactly cheap...." Read more

10 customers mention "Hold"10 positive0 negative

Customers like the hold of the product. They mention it holds bits firmly by locking mechanism or magnetism. They also say it's the perfect bit holder when working in tight places. Customers also appreciate that it's smooth, with no wobble and no tendency to rotate the housing.

"...The extension locks in my driver and holds the bits firmly. In addition, it is far more robust than the other thing I was using...." Read more

"Good quality. Holds the bits well. Worked well for a furniture / desk that I had to dissemble, then move and reassemble...." Read more

"...This keeps a tight hold on the bit so you won’t lose it in the wall and is rated for heavier duty applications and higher torque that my old $10..." Read more

"...It also has a magnet to hold non-locking bits. It is longer than most extensions...." Read more

4 customers mention "Ease of removal"4 positive0 negative

Customers find the fastener drive bit easy to use. They mention it's useful for removing fasteners, has good quality, and is great for extracting when you can't see your target.

"Product is easy to use, Easy removal, put it through some decent abuse throughout the last 365 days strongly recommend" Read more

"...Great for extracting when you can’t see your target though." Read more

"Very useful to remove fastners. A strong magnet would be perfect to hold fastners on the tip." Read more

"Really good quality and you can unscrew even something bug." Read more

17 customers mention "Flexibility"8 positive9 negative

Customers have mixed opinions about the flexibility of the fastener drive bit. Some mention it's durable and reliable, while others say it's barely flexible and wobble is to be expected.

"...It's heavy, and not that flexible...." Read more

"Makita wins again for innovation. This is one of it's kind that has flex shaft AND is also impact ready...." Read more

"...Feels solid and well made. My only complaint is that it's a bit rigid and you have to really press the tip into the screw because if not it slips..." Read more

"...This thing flexes allowing me to reach the hard to get to fasteners...." Read more

The ONLY one to purchase
4 out of 5 stars
The ONLY one to purchase
It’s heavy duty, made from Japan and works fantastic with my impact driver. I purchased another one that you can see all over the site, but as others have said it’s cheaply made it breaks very easily. This one is solid heavy and just works. It does have its limit, so just know how to use it.My only gripe about this is it’s very expensive, at $35 it should be $10 less. But I guess you get what you pay for.I’m very happy with an recommend it
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Top reviews from the United States

Bob Pip
5.0 out of 5 stars Top Notch
Reviewed in the United States on July 25, 2024
Verified Purchase
This is one of those tools that is just a pleasure to use. It feels robust and just works. I've used a few different flex shafts and this one is a keeper.
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brandy Anderson
5.0 out of 5 stars I call this my extension of my short fingers
Reviewed in the United States on July 7, 2024
Verified Purchase
The strength of the magnet could be a lil better but it does work well. It is pretty strong and doesn’t twist us like some of the cheaper models like these. The length is good. I do wish it blended for better flexibility. Definitely a told that everyone should have in their tools sets.
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Fishingfan
5.0 out of 5 stars Well buiit
Reviewed in the United States on November 8, 2023
Verified Purchase
i'm a serious DIY who needed to drive 2-3 inch deck screws in hard reach places, I tried one of those flexible drill adapters you everywhere online if you search for a flexible extension. The one I purchased worked but was very difficult to use because (1) the bits do not lock into the end like it does in my impact driver, and (2) the extension is designed for a drill so the extension doesn't lock in my driver either. It was almost a 4 hand process to hold the bit and screw on one end, press the extension in my driver and try to run the impact driver. The Makita B-51873 extension solves all these problems. The extension locks in my driver and holds the bits firmly. In addition, it is far more robust than the other thing I was using. It handled the deck screws I was using with no problem, so I wanted to see what the extension could handle. To test it I bent it to 90 degrees and drove 1/4 x 3 inch lag bolt into a pine 2x6 without a problem.
9 people found this helpful
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Amazonian Connoisseur
4.0 out of 5 stars The ONLY one to purchase
Reviewed in the United States on March 18, 2022
Verified Purchase
It’s heavy duty, made from Japan and works fantastic with my impact driver. I purchased another one that you can see all over the site, but as others have said it’s cheaply made it breaks very easily. This one is solid heavy and just works. It does have its limit, so just know how to use it.
My only gripe about this is it’s very expensive, at $35 it should be $10 less. But I guess you get what you pay for.
I’m very happy with an recommend it
Customer image
Amazonian Connoisseur
4.0 out of 5 stars The ONLY one to purchase
Reviewed in the United States on March 18, 2022
It’s heavy duty, made from Japan and works fantastic with my impact driver. I purchased another one that you can see all over the site, but as others have said it’s cheaply made it breaks very easily. This one is solid heavy and just works. It does have its limit, so just know how to use it.
My only gripe about this is it’s very expensive, at $35 it should be $10 less. But I guess you get what you pay for.
I’m very happy with an recommend it
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Customer image
Customer image
7 people found this helpful
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RS
5.0 out of 5 stars Sturdy product - Well built and worth the cost.
Reviewed in the United States on July 21, 2021
Verified Purchase
Makita wins again for innovation. This is one of it's kind that has flex shaft AND is also impact ready. There are others out there that make this claim but hardly stand up to expectations - I have tried out the one from Ryobi and Hercules (Harbor freight). Have already used this for driving countless deck screws, lag screws and other fasteners into dimensional lumber at various positions that require flex shaft and this one always makes it mark. Makita has already lubricated and sealed the shaft with some form of PTFE grease that should keep it going for years.

For those who are complaining about the shaft breaking - just make sure you do not bend it past 90 degrees because it "will absolutely" break the shaft. The instructions clearly say so. In fact if you find yourself going 90 and above then this may not be the tool for the job. You may want to consider the impact ready bit holder from DeWalt that can pivot to 120 degrees as a tool of choice - of course at the cost of loosing the flex shaft functionality.
4 people found this helpful
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Joe of Distinct Crafts Chicago
5.0 out of 5 stars Flex drill bit accessory.
Reviewed in the United States on November 15, 2023
Verified Purchase
Good quality. Holds the bits well. Worked well for a furniture / desk that I had to dissemble, then move and reassemble. Many of the screws were not accessible with a rigid driver.
One person found this helpful
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Jern
5.0 out of 5 stars Fantastic, but still keeping the cheap Ryobi
Reviewed in the United States on May 16, 2020
Verified Purchase
So the fit and finish on this thing is a cut above which is obvious as soon as you hold it in your hands. Nothing is made to last forever, but this is pretty close and I’m unsure of another flex extension that’s better at anywhere near the price. This is also a Japan made Makita product which I’ve found to be a cut above the stuff Makita makes from other Far East countries.

Much like the difference between the Dewalt right angle bit holder and Milwaukee impact right angle with the handle.

This keeps a tight hold on the bit so you won’t lose it in the wall and is rated for heavier duty applications and higher torque that my old $10 Ryobi just couldn’t handle.

That being said, my Ryobi isn’t going on the trash. As with everything, really depends on your needs and use cases. Since the Ryobi is a little less rigid, that means you also get a lot more bend and flex out of it, so it may reach places the Makita can’t and be ideal for light applications such as furniture or cabinet installs.

So, as with most things, you get what you pay for. Just make sure you are paying for the thing you need
27 people found this helpful
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Dan Loo
5.0 out of 5 stars Works great, much better than my cheap one.
Reviewed in the United States on March 11, 2023
Verified Purchase
This worked very well for me. I drilled holes in 1/4" steel up to 3/16" with no issues.
Of course if you go much higher the torque when it catches will likely wind it up.
But it works very well for small drilling.
It does get warm as you drill. Quite hot actually. But as long as you don't touch the very end (metal part) it's good.

Worth the money, I have a very cheap one that doesn't do nearly as well.
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Top reviews from other countries

JJ
5.0 out of 5 stars This is a great tool that works very well at high torque with ...
Reviewed in Canada on May 17, 2018
Verified Purchase
This is a great tool that works very well at high torque with impact drivers. Highly recommended to anyone who had issues with cheap flexible bit holders like me and who are looking for a reliable one.
3 people found this helpful
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piotr
5.0 out of 5 stars Five Stars
Reviewed in Canada on February 23, 2018
Verified Purchase
Excellent. High quality tool worth every penny
2 people found this helpful
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