Grinding Wheels for Stone | McMasterCarr
220 grit: 320 grit: 400 grit: 600 grit: 800 grit: 1500 grit: 1800 grit: Abrasive Material. Silicon carbide cuts through concrete and stone without generating much heat. Wheels are also known as Type 27 wheels, raisedhub wheels, and grinding discs. Grinding Wheels for Metals.