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Bosch GT300 1/4-Inch Carded Glass and Tile Bit

by Bosch

106 customer reviews

Price:

$6.98 & FREE Shipping on orders over $49. Details

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Size: 1/4-Inch

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Precision tip - solves bit wander and bit walking
Available in large sizes offered by no one else (up to 1-Inch). Sold in open stock or in kits
High quality carbide with a reinforced head that prevents bit cracking and provides a longer life
Three flat shank to prevent slippage
Bosch branded, innovative geometry allows bits to drill faster

› See more product details

This item is available because of the Add-on program

The Add-on program allows Amazon to offer thousands of low-priced items that would be cost-prohibitive to ship on their own. These items ship with qualifying orders over $25. Details

35 new from $3.49

Bosch GT300 1/4-Inch Carded Glass and Tile Bit

$6.98 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

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Product Information

Size:1/4-Inch

Technical Details

Part Number	GT300
Item Weight	0.2 ounces
Product Dimensions	6.6 x 2.7 x 0.2 inches
Origin	Anguilla
Item model number	GT300
Size	1/4-Inch
Color	Blue
Material	Carbide
Item Package Quantity	1
Measurement System	Inch
Batteries Included?	No
Warranty Description	No

Additional Information

ASIN	B00292AAUM
Customer Reviews	106 customer reviews 4 out of 5 stars
Best Sellers Rank	#19,914 in Home Improvements (See top 100) #21 in Home Improvement > Power & Hand Tools > Power Tool Parts & Accessories > Power Drill Parts & Accessories > Drill Bits > Masonry Drill Bits > Rotary Hammer Drill Bits
Shipping Weight	0.2 ounces (View shipping rates and policies)
Date First Available	May 22, 2009

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Customer Questions & Answers

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Customer Reviews

106

4.0 out of 5 stars

5 star		51%
4 star		17%
3 star		12%
2 star		10%
1 star		10%

See all 106 customer reviews

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Top Customer Reviews

Very efficient and apparently quite durable

By Amazon Customer VINE VOICE on June 3, 2012

Size: 1/2-Inch Verified Purchase

There's not a whole lot to say about a drill bit but this is a good one. I had to mount some bathroom and shower grab rails for a friend. This involved drilling a total of 18 holes through glazed porcelain tile. I thought that (1) this would be difficult and time consuming and (2) that it would probably require several bits. I ordered two and one of them is still in the package. The drill penetrated the tile quickly and easily, leaving perfectly clean half inch holes with no chipping around the edges. It seemed just as sharp on the 18th hole as it was on the first. Add to that nice flats on the shank that keep it from turning within the chuck. I was very pleasantly surprised.

Here's a tip if you don't know it already. To keep the bit from wandering on the glass or tile surface before it bites into the material, stick some masking tape in the area and mark your drill holes on the tape. It holds the bit until it can bite and then you just peel it away and the hole is precisely where you wanted it to be.

A really good product. Thanks, Bosch!

Oh, and by the way, thanks for my refrigerator, dishwasher, and sabre saw, as well. All absolutely top notch.

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USE WATER!!!

By 99b0ttles on October 23, 2013

Size: 1/4-Inch

I have read several reviews about tile and diamond bits. It seems that many people do not understand that you must use water often to cool these bits or they will get to hot. You either need someone pouring water on the bit or a cup to dunk it in (or both). DO NOT use these bits without water on glass, tile, marble (or similar surface) or you will destroy them.

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Drills through glass beautifully

By Shari Youngblood on September 21, 2011

Size: 1/2-Inch Verified Purchase

I purchased this to use when making accent lamps out of empty wine bottles. The bit not only drills through glass relatively easily, but the resulting holes are "cleaner" than those produced by other bits I've used. No flying shards, clean hole; will definitely buy again.

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Easily drills through MARBLE wall tiles

By Retired techy on December 15, 2009

Size: 1/4-Inch

I researched all sorts of drill bits and techniques to install two Ginger towel bars through 3/8" thick marble wall tiles in our new bathroom. Marble is not as hard as granite, but can be split/cracked if the wrong drill bit is used. The tile store insisted I use a diamond core bit that proved too difficult for the novice (me) to use properly. I only had 8 holes to drill and wasn't going to risk learning on the job how to use the diamond core drill bit. This Bosch GT300 drill bit (and the smaller 3/16" GT200) went through the tiles very easily. I just took my time, used a slow drill speed with moderate pressure, and kept the bit cool with an occasional dunk in water. The tip of the bit started the holes right where I marked them on the walls rather than walk around the face of the tile as the diamond core and masonary bits tend to do. If you have one, you can use a Dremel tool with their Tile Cutting Bit # 562 to start the hole as well - just enough to prevent the larger 1/4" bit from walking the face of the tile.

I've always liked Bosch power tools, and their accessories like these Glass & Tile Bits are super.

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Not the best for porcelain tiles

By Franklyn Miller on December 2, 2010

Size: 1-Inch Verified Purchase

If you are using this bit for porcelian tiles, then you batter have a lot of time on your hand. This baby cuts perfect but takes a lot of time because it constantly needs to be cooled. this is not good on a heavy duty construction project with lots of holes. The smaller versions cut better. I have found that using the small holes and gradually increasing the size give the best results but this is a time consuming process. These beat the core drills in that if they were faster; they doo not need to be cleaned out after every hole. Plus there is a very clean hole with no chips at all. If you are impatient stay away the harder you push on these the more quickly they will get dull and can even bend. Slower speeds work best.

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BELOW AVERAGE quality !!

By Retired Navy Guy on November 14, 2011

Size: 1/8-Inch Verified Purchase

These Bosch bits (both 1/8 & 3/16") are not very durable. They have poor heat resistance, and dull very quickly. I had to use TWO of 1/8" ones to get through 3/8" thick ceramic quality, expensive flower pot bottom that needed drainage holes for outdoor use. I thought maybe I should have used bit of water cooling after totally ruining the first one so with second one I did keep water on the workpiece. After getting all 4 holes completed even the 2nd bit was so dull it wouldn't satisfactory cut through a thin, cheap ceramic 2x2 tile. At $7.00 per bit I expect something more than a disposable bit.

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Works great

By Travis M. on August 18, 2010

Size: 1/2-Inch Verified Purchase

Place a couple pieces of tape on the glass (wine bottles in my case) you are drilling through, that way the bit doesn't slip on the glass, Once you get the hole started I think it's easier to remove the tape and continue (it smells better at least). Take your time! glass drilling is a slow process, but this bit is MUCH better than doing it with sand paper on the dremel!

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Bosch brand better than most others

By Evil Dead on April 26, 2015

Size: 1/8-Inch Verified Purchase

This Bosch bit is better than most other brand tile bits out there. It lasts longer and breaks slightly less often than most other brands. Cooling the bit heads off with water in a small cup every 3 seconds of drilling on these bits increases their lifespan. Porcelain tile and concrete are the roughest on tile or masonry bits and require this cool down process frequently. Clay tile and cinderblock are very easy for these bits to get through and require less cooling time. If you don't cool down the bit and you break the carbide head off in the hole you are drilling then you will have a big problem since the head will usually be difficult if not impossible to extract from the hole. You will then have to use a hammer drill and another bit to try to "push" the head through the hole or drill in a different spot.

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See all 106 customer reviews (newest first)

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Customer Images

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Most Recent Customer Reviews

Two Stars

It didn't work on drilling a hole on ceramic tile.

Published 2 days ago by S. CHIANG

These do not drill porcelain tile

These do not drill porcelain tile. The description should state this. The package does in small print.

Published 4 days ago by E. Vogler

Four Stars

GOOD

Published 8 days ago by Amazon Customer

Five Stars

drills well

Published 13 days ago by John Logan

Walks like crazy, cuts slowly.

I purchased this drill bit after burning out a glass and tile bit made by another company. I returned to the hardware store and figured that a more expensive bit would but better... Read more

Published 24 days ago by Squeak

Awesomely surprised

Went through tile like drilling through wood . Bought 2 only needed 1 for drilling 96 holes at 3/4" . The second is still in the package .

Published 29 days ago by Sheila

Five Stars

Great product works as it should. Quick shipping and packaged well.

Published 1 month ago by Amazon Customer

Great for holes in ceramic flower pots

Worked like a charm. I had bought a bonsai tree and the ceramic pot had no holes in it. I let water pool in the area where I drilled a hole, and the drill worked as advertised. Read more

Published 1 month ago by JMS

Dulls very quickly

The drill bit tip seem to dull with second hole, even though I used flowing water throughout the drilling process

Published 2 months ago by Amazon Customer

One Star

Just got it and break it while drills nag the first tile !

Published 2 months ago by Mike Ed