BOSCH GT100 1/8inch Carbide Tipped Glass

I had to drill 12 holes through my shower tiles to install grab bars for my wife. I was more than apprehensive since I had never drilled tile before. I wanted to get a good set of drill bits to minimize the chance of breaking irreplaceable tiles (1950s color is no longer available). After looking at many glass/tile bits and bit sets, reading review after review, I finally settled on the Bosch GT3000 8-piece set. I couldn't have made a better choice. After placing the grab bars where I wanted them, I masked over the footprint for each end of the bars, then placed the bars back on their desired location and marked where each hole would go. Then, taking "the bit in my teeth," so to speak, I got ready to drill the first hole. I had filled a water bottle to cool the bit, just as I had read on some "how-to" site. I pressed the bit tip into the tile and heard a small crack as the tip penetrated the glaze. Drilling at a slow speed and keeping a small stream of water at the contact point, I proceeded. My heart was beating a 100 times a minute and my breathing was shallow. I was scared to death. Within seconds, the bit was through the tile. On to the second hole - same experience. Then, before I knew it, I had all twelve holes drilled and not one cracked or chipped tile. These bits are so sharp that the twelfth hole drilled as easily and quickly as the first, and every hole was clean as a whistle. I finished the holes with a regular titanium high speed bit, mounted the bars, and voila, a done deal. I cannot say enough in praise about these Bosch glass/tile bits. They are worth every cent andt then some. I highly recommend them. When you buy the best, you can expect the best in performance. Oh, and the case is really nice, too. And, the buying experience? It was worth the time spent researching, being a Prime member and getting the bits two days after ordering, free shipping, and everything else I've come to expect from Amazon. I also bought with confidence knowing that Amazon stands behind everything they sell. All-in-all, and excellent experience.

Worked great. Used it quite a bit already, and it does not seem to dull very fast which is great when working with tile.

I've been making knives. I need to drill pin holes into hardened steel. Not as easy task. I bought the 1/8" 5 pack. The first one did great. I drilled about a dozen holes before the shaft shattered. The 2nd bit drilled 1-1/2 holes and it just stopped drilling. I am using a cutting fluid oil. That is a must. Drill slow. With a bit of oil I drill till I break the surface. I back off and add more fluid. I dill about 1/3 the way and back off for more fluid. Then 2/3. Then final punch thru. Holse are clean and look good. I'm not sure why 1 bit lasted for about a dozen holes and the 2nd lasted for 1-1/2 holes.

I bought these to drill holes in my bathroom tile to install a new toilet paper holder and towel bar (our entire bathroom is tiled from floor to about 6 foot high). In order to not chip the tile, I used blue painters tape to mark where the hole should be drilled. This tile drill bit cut a clean hole, no cracks and worked like a hot knife through butter.

I had to drill 3 holes in my ceramic tile fireplace for toggle bolts to fit in to devote my mantel. This type of bit was great as it stayed center at the starting point and powered through all 3 holes. You could feel it getting slower at the third hole but I bet I could have gotten a few more out of it before it was completely dead. Took me about 10 mins per hole, with a cordless 18V drill, and I was taking a few breaks for it to cool and to dip it in water to start again. Overall it was well worth the money and allowed me to wiggle it around the outer rim of the holes to make it a little larger so that the toggle bolt could squeeze in since it’s a tad over 5/8” with the pin. Will buy again if I need to drill into tile.

These are unbelievably sharp for the first few seconds. I had to drill 12 hole in tile to hang three shelves. I selected the bit that was the right size for my screws, and scored the spot I wanted to drill before I started. I kept the bit cool with water as I worked.. That bit was basically shot by the time it got all the way through the tile, and much to dull to start a second hole. Fortunately the set included several larger bits. I got through my 12 holes by using these to get the holes started in the right locations and then, once the opening of the hole was the diameter I needed, switching to a diamond tile hole saw. The hole saw worked much faster and lasted a lot longer, but was impossible to get started in the right spot. In combination with these bits I was able to finish my holes. If you need to drill a lot of holes, get this set to get the holes started and a "tile hole saw" or three in the correct diameter to finish the job. Don't expect to pass these down to your kids.

The Bosch GT300 1/4-Inch Glass and Tile Drill Bit is a reliable and well-engineered tool that delivers excellent performance for both professionals and DIY enthusiasts. Designed specifically for drilling through glass, ceramic tile, and similar materials, this bit stands out for its precision, durability, and ease of use. One of the most impressive features is the carbide spear-point tip, which provides smooth and accurate starts with minimal walking. This makes it ideal for delicate surfaces where precision is critical. The tip design also contributes to clean holes with reduced chipping, even on brittle materials. During testing, the GT300 maintained its sharpness and cutting efficiency across multiple uses, outperforming many comparable bits in its class. The bit also handles low to moderate drilling speeds well, which is crucial when working with fragile surfaces like glass or porcelain tile. Another highlight is the build quality. Bosch’s commitment to manufacturing excellence is evident in the consistent performance and longevity of the bit. Whether used in a cordless drill or a drill press, it delivers professional-grade results. In summary, the Bosch GT300 1/4-Inch Glass and Tile Drill Bit is an excellent addition to any toolkit. It offers a perfect balance of precision, durability, and value, making it a go-to choice for anyone needing clean, accurate holes in tile, glass, and ceramics.

Usamos a broca para perfurar porcelanato e foi ótima.

Great product and quality

Lo usé para instalar una barra de seguridad en la ducha del baño. Entró perfectamente y no resbaló en el azulejo.

Shorter than expected based on the pictures - the unpainted part of the shank is only 40mm. The shank is fully cylindrical, with no three-flat design. I used it to drill through tiles. The first hole went well, but the second felt noticeably harder, so I wouldn't expect it to last very long.