Description: High Quality Diamond Hole Saw 6mm-30mm Tile ceramic glass porcelain marble drill Diamond dust hole saws are suitable for drilling ceramic tiles, glass, marble, slate and porcelain tiles up to hardness grade 5For use with conventional power drills on the lower speed settings with the hammer action disabled. Always use lubrication (water ), otherwise the diamond core drill will burn. When cutting hard materials it is important to ensure the drill is kept cool to avoid damage to the material being drilled and premature wear of the drill. Using water as a coolant/lubricant will substantially extend the life of these hole saws. If you're drilling on a vertical surface try a hand spray water bottle, or sponge soaked in water and held underneath, but in contact with the drill bit. Keep the bit as wet as possible during operation, if the bit dries out during use it will overheat and immediately blunt. Hole Saw for Glass It is clean,smooth cut no broken edges and no tremor phenomenon Small incision resistance, improves the opening speed Excellent for clean and accurate holes on glass and tile Designed with diamond coated tip and sturdy metal housing, offers good performance and a longer life Application for: Suitable for glass, tiles, marble, jade and other hard and brittle materials in drilling. It must be placed only in a common electric drill, may coolant, drilling, drilling force should light be used to be slow, especially the glass opening at the beginning of the drill and drill, is currently the ideal opening tool Specifications: Product Name: Glass Hole Saw Material: Metal Alloys Package included: 10 x Glass Hole Saw (6mm 8mm 10mm 12mm 16mm 18mm 20mm 22mm 25mm 30mm) Note: 1.Please allow 1-3mm error due to manual measurement. 2.The color may be different with the true item due to the screen display, pls understand. Style NO: 2A0272