ITEM NAME:4 inch 100mm 80-2000# Diamond Coated Flat Lap Wheel Lapidary Polishing Grin I9S8 4 inch 100mm 80-2000# Diamond Coated Flat Lap Wheel Lapidary Polishing Grin I9S8 Polishing Laps Mainly used for polishing Crystal, Agate, Jewel and Jade, and suitable to grind and polish jewelry, glass, rock, etc. Diamond coating surface area: almost 97% All our flat laps wheels have a 4 inch (approx.) outer diameter and 5/8 inch (approx.) arbor hole and are intended to be mechanically clamped to a Master Lap. Color: silver Specifications: single side Product Name: Diamond Grinding Disc Material: Diamond Outer Diameter: 100mm (4 inch) Arbor Hole Diameter: 16mm (5/8 inch) Grit: 80#/180#/240#/400#/800#/1000#/2000# Package Includes: 7 x Polishing Grinding Disc