Amazon: 20Pcs Diamond Grinding Bits, 5mm …
3x6mm Diamond Cylinder Burrs, 1/8inch 3mm Shank 6mm Cylinder Head Diamond Grinding Bit Mounted Point Grinder Parts 10pcs 1 offer from $9.99 1/8" Shank Diamond Coated Cylindrical Grinding Mounted Point Bits Burrs Compatible with Rotary Tool Bit, 4 mm Head, 10 pcs