Brand new and high quality.Easy to use, high quality,good performance, long life.Can be used with a standard electric drill.Always use lubrication (water), otherwise the diamond core drill will burn.Suitable for use in drill hole on glass, marble, tile or granite and so on.Color: silverMaterial: tungsten steelUse Tips:1. Please add water for coolant and drill slowly.2. Start drill at 45 Degree to surface and align to 90 Degree as hole forms.3. Never use drills while machine is in hammer action.Model:Diamond Coated Core Drill BitOutside diameter:60/80/100/120 mm, 2.36/3.15/3.94/4.72 inchPacking Include:4 x Diamond Coated Drill BitsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.