Check the listing for details. 8" inch 200mm Diamond Grinding Discs Grit 60-3000 Flat Lap Disk Tools for Stone. Color: Silver, Condition: New. Listed at 19.99 USD. JINGLING 8" inch 200mm Diamond Grinding Disc Coated Flat Lap Disk Wheel Grit 60- 3000 Product Specification: Product Name: 8 inch diamond grinding disc, 8 inch diamond flat lap disc, Grinding wheel 200mm Outside diameter : 8" inch (200mm) Arbor hole : 1/2" (12.7mm) Thickness: 0.04" (1.1-1.4 mm) Grit: 60- 3000 ( Please choose one grit from the drop-down list) Grit type: Coarse/ Medium/ Fine Diamond coating surface area : almost 95%, only one side is coated diamond Recommended speed: 1400-2800RMP Total Quantity: 1 Piece Wet use recommended Suitable to grinding gemstone, jewelry, glass, rock, etc. These diamond discs are one of the finest discs manufactured for Hobby, Lapidary, Glass applications The diameter flat lap wheels have a high density quality diamond coating. They are absolutely flat and parallel to meet the most exacting faceting requirements. Use the fine grit diamond lap pad to smooth and shape pieces and create polished flat surfaces When used as part of a multi-stage grinding and polishing process it's easy to create smooth finished edges with a professional look Quick Tips 1. Recommended for rough and fine grinding on faceting material plus general lapidary grinding when precision is required. 2. All our flat laps wheels have a 1/2" arbor hole and are intended to be mechanically clamped to a Master Lap. 3. The laps are made with 1mm thick steel plate that has been machined true and flat. The lap is stiff enough to be used as is, but we recommend with the use of 8 inch Aluminum Master Lap. Also Available in Grits 60, 80, 100, 120, 150, 180, 240, 320, 400, 500, 600,1000, 1200, 1500, 1800, 2000, 3000.