DT DIATOOL Diamond Core drill bits Kit 2pcs 6mm with 20mm Chamfer Bit M14 Thread and Hex Adapter Hole Saw Set for Porcelain Ceramic Tile Marble Granite

6mm drill bit: diameter 6mm, total length 60mm, diamond height 10mm.Diamond chamfer bit: diameter 20mm; workable length 20mm; total Length 40mm. chamfer angle: top angle 56 degree; Grit:#80/#100. Hex adapter : connect 5/8" thread to 3/8" hexagon shank, shank length 28mm, total length 53mm. Multi-use: diamond drill bits for drilling holes and diamond chamfer bit for enlarging, polishing and shaping holes.Suitable for ceramic tile, porcelain tile, granite, marble,etc. Not recommend drilling concrete. Boxed package: The drill bit is easy to store, the box is portable and used repeatedly. Machine universal: Used on angle grinder,the recommended RPM: 6000RPM;Max RPM: 11000RPM.With hex adapter, you can use these drill bits on the hand drill. Notice: don’t use the hammer mode and please keep drilling at a high speed if you use the hand drill. General speed of hand drill is 2000-5000RPM. The higher the speed, the longer the worklife of drill bits. All bits are produced in vacuum brazed technology, longer life than electroplated drill bits. U Shape incision, reduce cutting resistance and improve drilling speed.