Description: 6-inch outside diameter, 3000 Grits , quality electroplated diamond coated flat lap disk wheel. The flat laps wheels have a 1/2-inch arbor hole for . They are absolutely flat and parallel to meet the most exacting faceting requirements. For grinding and polishing jewelry, glass, rock,stone, granite,etc. Recommended for rough and fine grinding on faceting material plus general lapidary grinding when precision is required. Please Notice: Only one side of the Diamond Disc is with diamond particles.