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How to Cut Successfully:1. Make a half-moon-shaped notch on the glass/tile/stone drill with 45 degrees.2. Slowly raise the drill bit to 60 degrees, and then lightly drill.3. Reach 90 degrees and continue drilling.4. Finally, the glass/brick/stone is drilled. This technique requires the drill bit to "shake" instead of applying steady pressure all the time.Warm Tips:1. Please add water as coolant and drill slowly.2. Start drilling the surface at an angle of 45 degrees and align 90 degrees when forming the hole.3. Never use an electric drill when the machine is in a hammering state.4. The hole does not need to be laborious, because the cutting is clean.Each Tile Hole Saw with a Removable Center Guide Bit--No Special Guiding Tools NeededCutting Hole Diameter:0.62"-4.72" / 16-120mm;Cutting Depth:1.18" / 30mm;Shank Diameter:0.39" / 10mm;Shank Height:1" / 25mmHigh-Performance Materials:The glass hole cutter is made of high-quality iron alloy,which is very sturdy and durable.At the same time,the surface is nickel-plated,which has good rust resistance,corrosion resistance and prolonged service lifeSpecification:Product Name: Glass Hole Saw.Total Size: 52 x 16mm / 2.05 x 0.63inch (L*D)Shank Size: 20 x 7.2mm / 0.79 x 0.28inch (L*D)Drilling Diameter: 16mm / 0.63inchpacking:1x Glass Hole Saw.