Diamond Core Drill Bits Set 10pcs (6/6/8/25/35/50/68mm+10mm Finger Bit+50mm Beveling Chamfer Bit+Hex Adapter) Serrated Hole Saw Kit SANLEETEK for Ceramic Tile Porcelain Marble Granite M14 Thread

【Specifications】10pcs: 7pcs 6/6/8/25/35/50/68 Drill bits+1pc 10mm Finger Bit+1pc 50mm Beveling Chamfer Bit+1pc Hex Shank Adapter 【Application】Widely use for dry and wet drilling/beveling/enlarging/shaping holes in porcelain tile ceramic marble granite, stoneware, quartz 【High Performance】Advanced vacuum brazed technology and high-quality diamond provide high efficiency and long life 【Unique Detail】The inside of 6-10mm drill bits are filled with cooling wax helpful for cooling and lubrication. Special serrated bits above 20mm improve sharpness and drilling speed. Multiple chip removal grooves to facilitate chip discharge for higher work efficiency 【Recommended Machine】Fits on M14 thread angle grinder. Recommended speed 6000RPM, maximum speed 11000RPM. If you want to use electric drill or other machine, you can use Adapter in the package. Minimum RPM: 2000; Faster the RPM, Longer the Working Life