Premium Quality: Our glass hole saw with positioning pilot drill is made of high quality diamond, solid hardened steel body and the surface is nickel plated, which ensures high hardness, rust protection, corrosion protection, durable and sturdy 【Precise Positioning Pilot Drill Design】Each tile hole saw is equipped with a removable positioning pilot drill. The cutting head of the pilot drill bit is also equipped with a diamond coating, which makes it sharper and more durable and effectively fixes the hole position of the hole saw so that it can cut holes quickly. 【Size】Cutting diameter: 110 mm, cutting depth: 35 mm, total length: 70 mm, triangular shank diameter: 10 mm. 【Sharp and clean holes】 These diamond drill bits with thicker diamond coating make the groove edge sharper and can cut precise flat-bottomed holes without chipping on smooth surfaces such as ceramic tiles, ceramics, glass, marble, granite, etc. Terrazzo. Cutting depth up to 30 mm 【Easy to use】 The operation is simple