Diamond Core Drill Bits Kit – 8pcs (6/6/20/25/35/50mm+50mm Beveling Chamfer Bit+Adapter) Tile Hole Saw Kit for Porcelain Tile Ceramic Granite Marble Masonry Stone. PACKAGE INCLUDE? 8pcs/box: 6pcs drill bits: Diameter (6/6/20/25/35/50mm), Diamond height 10mm, Diamond grit: #35/40; 1pc 50mm Beveling Chamfer Bit, working depth: 20mm, Grit: #80/100 ;1pc Triangle Shank Adapter. APPLICATION? Using for dry or wet drilling, grinding, beveling, enlarging, shaping and reaming in Porcelain Ceramic Tile Marble Granite Stoneware Quartz Microcrystalline Stone Artificial Stone. SPECIAL DESIGN? Cooling Wax, U-grooves Design, Inclined Angle and 2 Functions in 1 Diamond Bits. Help heat dissipation and chip evacuation. Higher efficiency and better performance. RECOMMENDED MACHINE? Suitable for M14 thread angle grinder. Recommended RPM: 6000, maximum RPM: 11000. If you want to use electric drill or other machine, you can use SDS or Hex Shank Adapter etc. Triangle Shank drill bits suitable for any Hand Drill, Cordless Drill, Bench Drill. The faster the speed, the longer the service life.