Specification: 7pcs Core Drill Bit Diameter 6/8/10/25/35/50/65mm, diamond height 10mm, Thread: 5/8"-11; Diamond grit: #35/40. 1pc diamond milling bit 10mm, total length 65mm,diamond height 40mm;diamond grit #45/50. 1pc diamond chamfer bit diameter 50mm, total length 55mm, diamond height 46mm; diamond grit #80. 1pc 5/8" tharead to hex adapter. Application: Dry or wet use in ceramic tile, porcelain tile, marble and granite. Wet use extends life. Not for wood, glass and any metal material. Diamond milling bit and chamfer bit cannot be used for drilling, just for enlarging, trimming or beveling holes. Machine: Angle Grinder. Recommend RPM: 6000. Max RPM: 11000. Please try to get as close as possible to the recommended drilling speed to help prolong service life. If you fit them on hand drills, you can use hex adapter. And don't use hammer or impact mode. Fast drilling: Serrated special cutter head greatly improves sharpness and drilling speed; Serrated cutter head has several chip removal slots, dust can be quickly discharged when drilling, not easy to be clogged. Long life: Vaccum brazed technology enables a stronger bond between diamond, bond and substrate, greatly improving the drill bit's life and work fficiency. DT-DIATOOL Diamond Core Drill Bits Set - 6/8/10/25/35/50/65mm Tile Hole Saw + 10mm Diamond Milling/Finger Bit + 50mm Diamond Chamfer Bit + Hex Adapter for Porcelain Tile Ceramic Marble Granite