Diamond Core Drill Bit Set, DT DIATOOL 11pcs 6/6/8/20/25/35/45/50/65mm+6mm Carbide Positioning with Triangle Shank + 50mm Hex Chamfer for Porcelain Tile Ceramic Granite Marble

【Specification】9pcs core drill bit with triangle shank-6/6/8/20/25/35/45/50/65mm; 1pc carbide positioning drill bit with triangle shank (6mm); 1pc hex shank diamond chamfer bit(50mm); totally 11pcs. 【Application】Dry or wet drilling holes in porcelain tile, ceramic, marble, quartz, granite, masonry, etc. Not recommend for drilling glass and wood. 【Recommended Machine】Hand drill, bench drill. General hand drill speed is 2000RPM-5000RPM. Ensure that the drilling speed is not less than 2000 RPM. The higher the speed, the longer the work life. Don't use the impact or hammer mode. 【Durable and Sturdy】Vacuum brazing processing technology make diamonds are more exposed; So that core drill bits are sharper and improve work efficiency. The average service life of vacuum brazed drill bits is 3-5 times that of electroplated tools. 【Good Effect】: U-Grooves Design helps chip removal and improve the working efficiency of hole drilling. #40 sharp diamond, less debris and edge breakage on materials and better finishing effect.