【EXQUISITE CRAFTSMANSHIP】Our diamond drill bits are made of high quality carbon steel; industrial grade, with nickel plating to resist corrosion; Fine workmanship, super wear-resistant. wear and sharpness. 【HIGH QUALITY DRILL BITS】Each hole is smooth and precisely surface treated, and the thick diamond coating on the top can provide excellent cutting force to achieve maximum drilling effect. < p>【LARGE HOLES SPACING: These glass hole saws are arranged along the drill bit to facilitate the discharge of chips and other particles when cooling water penetrates and drills. Make the drilling process easier. 【WIDE APPLICATION】This glass drill bit set includes 15 different drill bits to meet your different needs. It is used for drilling hard surfaces such as glass, wood, ceramic tiles, bottles, jars, blocks, ceramics, slate, granite pumice, etc. 【NOTE】When cutting hard materials, be sure to keep the tool cool to avoid damaging the material. Drilling and premature wear of the tool; Lubrication