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Specification:Cutting Hole Diameter: 5/8" / 16mmCutting Depth: 1.1" / 28mmShank Diameter: 0.31" / 8mmShank Height: 0.83" / 21mmHigh Quality Material: Iron alloyPackage Includes:12 x 5/16 inch diamond hole sawHow to Cut Successfully:1. Make a half-moon-shaped notch on the glass/tile/stone drillwith 45 degrees.2. Slowly raise the drill bit to 60 degrees, and then lightlydrill.3. Reach 90 degrees and continue drilling.4. Finally, the glass/brick/stone is drilled. This techniquerequires the drill bit to "shake" instead of applying steadypressure 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 andalign 90 degrees when forming the hole.3. Never use an electric drill when the machine is in ahammering state.4. The hole does not need to be laborious, because the cuttingis clean.