... dia.3mm 4.grit:150# We have the following workshops: 1. Workshop 1: diamond electroplated products: diamond burrs, diamond files, diamond stone sharpeners, diamond electroplated cutting discs, diamond ... and diamond dry soft polishing pads 4. Workshop 4: carbide brazed tools, like files, hole saws, grout removers, wires, etc. 5. Workshop 5 ...