Premium Quality: Our glass hole saw with positioning pilot drill is made of high quality diamond, solid hardened steel body and the surface is provided with nickel-plated coating, which ensures high hardness, rust protection, corrosion protection, durable and robust 【Precise Positioning Pilot Drill Design】 Each tile hole saw is equipped with a removable positioning pilot drill. The cutting head of the pilot drill is also provided 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 quickly cut holes. 【Size】Cutting diameter: 110mm, cutting depth: 35mm, total length: 70mm, triangular shank diameter: 10mm. 【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 chips on smooth surfaces such as ceramic tiles, ceramics, glass, marble, granite, etc. Terrazzo. Cutting depth up to 30mm 【Easy to 【Use】 The operation