EXQUISITE CRAFTSMANSHIPOur diamond drill bits are made of industrial-grade carbon steel, with nickel-plated coating to resist corrosion; fine workmanship, super wear-resistant and sharp.HIGH-QUALITY DRILLSEach hole is smooth and precise surface treatment, and the thick diamond coating on the top can provide excellent cutting force to achieve cutting effect. maximum drilling.LARGE CLEARANCE HOLESThese glass hole saws are arranged along the drill bit to facilitate the removal of chips and other particles during cooling water entry and drilling. Make the drilling process easier.WIDE USEThis glass drill bit set contains 15 different drill bits to meet various needs. It is used for drilling hard surfaces such as glass, wood, ceramic tile bottles, block pots, ceramics, slate, granite pumice, etc.NOTEWhen cutting hard materials, be sure to keep the tool cool to avoid damage to the material being drilled and premature wear of the tool; water lubrication is required when drilling, which can extend the life of the drill bit set.Diamond Drill Bits - Why should I choose?Small diamond drill bits have a solid end and therefore a larger surface area , so they last longer than small diamond drill bits, but may take longer to drill a hole. They are more robust and therefore ideal for very hard and dense pieces of sea glass, very hard stones, precious stones, hard shells, bones and antlers. This tile hole saw is made in Industrial grade carbon steel with a corrosion resistant nickel plated body. Thick corundum coating on tops provides superior cutting force for optimal drilling results.Features:Material: Carbon steelWeight: 0.35 kgColor: SilverHole saw diameters: 6mm/0.24", 8mm/0.31", 10mm/0.39", 12mm/0.47", 14mm/0.55", 16mm/0.63", 18mm /0.71", 20mm/0.79", 22mm/0.87", 25mm /0.98", 28mm/1.10", 30mm/1.18", 35mm/1.38", 40mm/1.57", 50mm/ 1.97" Package includes: 15 * Diamond Coated Drill Bit