Check the listing for details. 8" inch Diamond Grinding Disc Grit 320 Abrasive Wheel Flat Lap Disk Stone Tools. Color: Silver, Condition: New. Listed at 19.99 USD. JINGLING 8" inch 200 mm Diamond Coated Flat Lap Disk Grinding Disc Grit 320 Medium Product Specification: Product Name: 8 inch diamond grinding disc, 8 inch diamond flat lap, Grinding wheel 200mm Outside diameter : 8" inch (200mm) Arbor hole : 1/2" (12.7mm) Thickness : 1.3mm Grit : 320Grit type: MediumRecommended speed: 1400-2800RMP Diamond coating Density : Perfectly high Diamond coating surface area : almost 95%, only one side is coated diamond 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. 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, 800,1000, 1200, 1500, 1800, 2000, 3000. We will send out your order within 1-2 days after payment has been received and cleared.