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This 30 piece professional quality diamond burr set has a shank size of 1/8in., and a grit of 180. This is GR-2 quality diamond and features assorted shapes. Black plastic storage case with clear face. Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing. Use on wood, jade, ceramic, glass, hardened steel, semi-precious stones and other hard materials.