Diamond Core Drill Bits Set 9pcs (20/25/35/50/68/100mm+20mm Finger Bit+50mm Beveling Chamfer Bit+Hex Adapter) Hole Saw Kit for Ceramic Tile Porcelain Marble Granite with M14 Thread SANLEETEK

【Specification】9pcs in total:6pcs 20/25/35/50/68/100mm M14 thread Drill Bits + 1pc 20mm Finger Bit+1pc 50mm Beveling Chamfer Bit + 1pc Hex Shank Adapter 【Application】Widely use for dry or wet drilling/beveling/enlarging/shaping holes in ceramic tile porcelain marble granite, quartz 【High Performance】Advanced vacuum brazed technologuy and high-quality diamond grain imporve the performance and lifetime 【Features】The design of the U-groove tooth shape is sharper, facilitating the discharge of debris 【Recommended Machine】The bits are suitable for M14 thread angle grinder. Recommended speed 6000RPM for diameter less than 100mm, 3000RPM for 100mm; maximum speed 11000RPM for diameter less than 100mm, 6000RPM for 100mm. 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