DT DIATOOL Diamond Core Drill Bits Kit 20/25/35/50/75mm with 50mm Chamfer Bit and 20mm Finger M14 Thread Hex Adapter Hole Saw Set for Porcelain Ceramic Tile Marble Granite

Used on M14 thread angle grinder. Recommended RPM: 6000; Maximum RPM:11000. Please don’t use the hammer mode if you use the drill bits on electric drill through the hex adapter. 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: 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.