Bench Grinders -1 Piece Diamond Grinding Wheel Disc Polishing Tool 400 Grit Highlights Generic Brand 1 Piece Diamond Grinding Wheel Disc Polishing Tool 400 Grit Description: Overall Diameter: Approx. 100mm / 3.94in; hole diameter: approx. 16mm / 0.63inch They are absolutely flat and parallel to meet the most demanding faceting requirements. For grinding and polishing jewelry, glass, rock, stone, granite, etc. Recommended for coarse and fine grinding on faceting material plus general lapidary grinding where precision is required Multi-sizes: 80 grit, 180 grit, 240 grit, 320 grit, 400 grit, 600 grit, 800 grit, 1000 grit, 1200 grit, 1500 grit (some items have dual blades) Package includes: 1 Piece Grinding Pad