Check the listing for details. 4'' inch Diamond Grinding Disc Abrasive Tools Grit 400 Medium for Angle Grinder. Condition: New. Listed at 11.80 USD. 4" inch Electroplated Diamond Coated Flat Lap Disk Grinding Wheel Grit 400 Fine Product Name: 4 inch Diamond Grinding Disc, Diamond Coated Grinding Wheel, Flat Lap Disk Outside diameter :100mm (close to 4" ) Arbor hole :16mm (close to 5/8" ) Thickness :1-1.1 mm Grit : 400 Fine Diamond coating Density : Perfectly high Diamond coating surface area : almost 95%, only one side is coated diamond Quantity:1 Piece Wet use recommended Suitable to grinding gemstone, jewelry, glass, rock, carving knife, 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 5/8" arbor hole for Angle Grinder. We will send out your order within 1-2 days after payment has been received and cleared.