Diamond Core Hole Saw ø6-100mm Hole Cutter Tile Porcelain Glass Drill Bit Cutter. Material: High Quality Diamond + Metal Shank Type: Round Shank (Size: 6mm, 8mm, 10mm) ; Triangle Shank (Size: 12mm – 100mm) Suitable Materials: Ceramic tile, Vitrified tile, Ceramic, Glass, Marble, Granite, Microcrystalline stone, Quartz stone, etc. Not suitable for materials: Tempered glass, Metal, Wood, Plastic. Suitable for device: Electric hand drill, Cordless drills, Bench drills, Angle grinders (adapter required). Please do not drill dry without water, reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably. Please choose the right material for your work, Please do not drill in toughened glass. When drilling, please be careful to wear protective gloves, eyes, face shield, etc. To prevent splashes of dust and debris from entering the mouth, nose and eyes. When this product is used with angle grinder, the angle grinder needs to be replaced with a chuck. The higher the speed, the more stable it is, the less likely it is to slip, and the more holes it can turn (recommended >2600pm) It is not recommended to use CNC type high precision machines to turn holes, it is recommended to use high power drills. How to use: Install the hole opener on a electric hand drill / cordless drills. When drilling, lean lightly against the marble at an oblique angle, the less force you apply the less you can slip and create a crescent-shaped positioning slot. After drilling the positioning slot, slowly straighten the drill and press down the hole at a constant speed. It is recommended that the drill speed is 100 rpm or more and that water is added for cooling throughout. IF YOU ORDER BIG. PLEASE CONTACT WITH US. According to your choice. Please take a look at more great items offered in my store, and we do hope you enjoy your shopping experience.