$100.79 + $6.00 shipping
Only 1 left in stock. Sold by langton_distribution_

Other Sellers on Amazon
Add to Cart
$43.00
& FREE Shipping on eligible orders. Details
Sold by: Amazon.com
Have one to sell? Sell on Amazon

Irwin 11580 Unibit20M 14-Millimeter to 24-Millimeter by 1/2-Inch Shank Hole Enlarging Step Drill Bit

4.8 out of 5 stars 114 customer reviews
| 6 answered questions

Price: $100.79 + $6.00 shipping
Only 1 left in stock.
Ships from and sold by langton_distribution_.
#20M (14-24MM)
High Speed Steel
    This fits your .
  • Enter your model number to make sure this fits.
  • Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates
  • Single-flute cutting edge for greater control through steps
  • 3 faltted shank prevents slipping in drill chuck
  • Patented single-flute cutting edge gives the user a true round hole every time
3 new from $37.99

Amazon Business Amazon Business


Special Offers and Product Promotions

Size: #20M (14-24MM) | Style: High Speed Steel
  • Working on a home project? Need some help? Check out Amazon Home Services and get $30 cash back when you book select services. Learn more


WARNING:
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Compare to Similar Items


This item: Irwin 11580 Unibit20M 14-Millimeter to 24-Millimeter by 1/2-Inch Shank Hole Enlarging Step Drill Bit
Customer Rating 5 out of 5 stars (114) 4 out of 5 stars (48) 4 out of 5 stars (4) 4 out of 5 stars (131)
Price $100.79 $64.78 $10.59 $14.70
Shipping $6.00 FREE Shipping FREE Shipping FREE Shipping
Sold By langton_distribution_ Amazon.com BeetrieDirect Amazon.com
Item Package Weight 0.2 pounds 0.45 pounds 0.55 pounds 0.3 pounds
Material Stainless Steel Titanium Nitride Coated steel Titanium
Measurement System Inch Inch Metric Inch
Add to Cart Add to Cart Add to Cart Add to Cart

Please help us improve this feature. Tell us what you think of this feature.

Product Description

Size: #20M (14-24MM) | Style: High Speed Steel

Product Description

Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. Single-flute cutting edge for greater control through steps. Three flatted shank prevents slipping in drill chuck. Patented single-flute cutting edge gives the user a true round hole every time. Description: #20M. Hole Sizes: 14 mm - 24 mm (hole enlarging). Number of Holes: 6 steps.

From the Manufacturer

UNIBIT 20M 6 Hole Sizes (14 mm - 24 mm), 2 mm Increments - Hole Enlarging

Product Information

Size:#20M (14-24MM)  |  Style:High Speed Steel

Technical Details

Part Number 10502863
Item Weight 3.2 ounces
Product Dimensions 8 x 8 x 8 inches
Item model number 11580
Size #20M (14-24MM)
Style High Speed Steel
Material Stainless Steel
Item Package Quantity 1
Measurement System Inch
Batteries Included? No
Batteries Required? No

Additional Information

ASIN B00075RG50
Customer Reviews
4.8 out of 5 stars 114 customer reviews

4.8 out of 5 stars
Best Sellers Rank #154,556 in Home Improvements (See top 100)
#75 in Home Improvement > Power & Hand Tools > Power Tool Parts & Accessories > Power Drill Parts & Accessories > Drill Bits > Step Drill Bits
Shipping Weight 3.2 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available November 9, 2004

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Feedback

Would you like to give feedback on images?
Would you like to tell us about a lower price?

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: High Speed SteelSize: #4 (3/16-7/8")
The unibit is fantastic for putting holes in thinner material. A plus is the hole will be deburred on the side you are drilling from. When drilling stainless steel (my experience was with 1/8" 316 ss) be careful to reduce RPM as each step goes through. It can work harden the material easily, and ruin the bit. A definate "MUST HAVE" for working with electrical enclosures and panels as well as sheet metal. Just don't throw away your normal twist drills.
Comment 23 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Style Name: High Speed SteelSize: #2 (3/16-1/2")
This Irwin 10232 Unibit is a high quality set step drill, made in the USA. While it does cost more than competing off-shore bits it is also significantly superior in all respects.

The Good:
Smooth, sharp cutting edges allows one to produce clean accurate holes with ease in thin metal, plastic and wood.
Pointed tip does indeed prevent the bit from wandering or skipping when starting a hole. No counterpunch or pre-drilling required to achieve accuracy.
The shank is formed to fit 1/4” hex drivers. The amazon product photo does not show these newer driver style shanks (at the time of this review).
Markings are highly visible and easy to read.
The quality workmanship of this product is obvious: sharp, finely machined, highly visible markings.

The Bad:
There really isn’t anything serious to complain about, so consider the following list to be nit-picking…
The bit fits standard 1/4” hex drivers, but the shank section before the groove is a bit shorter than normal (see photo). This is no problem whatsoever in magnetic drivers. In my non-magnetic Makita impact driver the bit had slightly more in-and-out play than usual, but it did not affect drilling performance. (I warned you I was nit-picking!).

Summary:
If you enjoy using top quality tools then this set is worthy of your consideration.

If you like short reviews - stop here!

On the other hand, if you like lots of extra information, then please by all means read-on…

The bit has a hex shank for positive slip-free use in standard drill chucks. This #2 bit also fits in standard 1/4” drill drivers, impact drivers, etc.
Read more ›
2 Comments 5 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Style Name: CobaltSize: #1 (1/8-1/2") Verified Purchase
I bought this bit as part of my tool kit to drill endpin jack holes in expensive guitars to mount the endpin jacks for internal pickups. Any drill bit will make a hole, but I wanted to make sure the wood on the guitars would be in perfect condition after the hole was drilled. Causing serious damage to a $5,000 guitar can ruin a guy's day, especially if he's the owner of the guitar. Typically, if no prior hole exists, a new 1/4" hole is drilled with a sharp brad point drill bit, followed by a precision tapered reamer from a guitar luthier supply house. However, sometimes a smaller hole already exists where a strap button was screwed in or a tapered end pin was press fit into a tapered hole. Perhaps the tapered endpin was even glued into the tapered hole and can't be removed without drilling. If a strap button had been screwed in, then the screw hole could be filled and a new hole could be drilled as if none had ever existed, followed by the precision reamer to safely bring the hole to its final dimension. On the other hand, this Irwin Unibit could be used to drill a tapered hole, using the strap button screw hole as a pilot hole, followed by the precision reamer to bring the hole to its final dimension. I have used the Unibit for this exact purpose, and it worked beautifully, with no damage to the guitar. If a tapered wooden strap button has been glued in, the button can be carefully sawed off near its base, and the hole can be drilled with a brad point bit and then reamed, just like the situation where no hole ever existed. But no sawing is needed if a punch is used in the center of the wooden end pin, a 1/8" pilot hole is drilled with a normal twist metal bit or a brad point bit, and the the Unibit is used to drill through the strap button and into the guitar.Read more ›
1 Comment 2 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Style Name: CobaltSize: #4 (3/16-7/8") Verified Purchase
This is the one to get. For $ 25 you can't touch this quality with anything else. I have more expensive step bits for electrical work and in my metal kit, but honestly I can't tell that they are better than this one by Irwin. And Greenlee and Klein are VERY proud of their stuff, when it comes to pricing !

I like the cobalt better than titanium because the cobalt is part of the metal, and so can be resharpened if needed, whereas the titanium eventually wears off.

Worked with another guy recently on my boat, and his bits kept breaking. I noticed they were the bright polished gold bits, like you see on Amazon and elsewhere for about half what the Irwin costs. So where's the savings if you have to replace your bit every few months ? I've always had good luck with Irwin stuff - they seem to be solid all around their line.

If you haven't used step bits yet, you will soon be converted. Not only are they great for making holes in thin metal (electrical boxes especially) but they work in wood and plastics too. And they are the only way I know of to make a small hole bigger (without resorting to elaborate schemes which take time and rarely work as well as I'd like).
Comment 2 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse

Most Recent Customer Reviews

Set up an Amazon Giveaway

Irwin 11580 Unibit20M 14-Millimeter to 24-Millimeter by 1/2-Inch Shank Hole Enlarging Step Drill Bit
Amazon Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers. Learn more about Amazon Giveaway
This item: Irwin 11580 Unibit20M 14-Millimeter to 24-Millimeter by 1/2-Inch Shank Hole Enlarging Step Drill Bit