BGTEC Dry Diamond Core Drill Bits 2pcs Diameter 8mm for Porcelain Tile Ceramic Marble Brick M14 Thread

【Size】Diameter 8mm,Total Length 60mm,Thread M14 thread,Diamond height 10mm,Max working depth 35mm, 【Wax inside Design】Our diamond bits have a built-in wax core for cooling and lubrication. This enhances the heat dissipation of the bit and improves performance as well as extends the life of the bit. 【Vacuum Brazed Technology】Increases resistance to temperature and friction,provide 6x the working life compared with electroplated bits,more heavy duty and wear resistant.High-quality core steel body helps to be more efficient and durable,not easy to deform. 【Materials】Dry/wet drilling for Ceramic Tile,Porcelain Tile,Marble,Granite,Stoneware,Quartz,Microcrystalline stone,Artificial Stone. Using water can prolong its life. 【Machine】Used for angle grinder, the recommend speed is 6,000 RPM, the max speed is 11,000 RPM. If you fit them on hand drill or other machines, you can use the hex shank adpater.