ITEM NAME:4mm x 10mm Round Ball Tip Diamond Burr Mounted Point Buffing Bit P7C3 4mm x 10mm Round Ball Tip Diamond Burr Mounted Point Buffing Bit P7C3 Product Name : Diamond Mounted Point;Tip Shape : Round Ball Shape Material : Metal, Diamond;Head Diameter : 10mm/ 0.39" Shank Diameter : 4mm/ 0.157";Total Length : 65mm/ 2.5" Color : Silver Tone;Weight : 10g Round ball nose, diamond coated head. Can be installed on the electronic grinder, hanging mill and hand electric drill (not included here). Used for sculpturing, dressing, precision grinding and internal grinding car.Round ball nose, diamond coated head.