150GRIT DIAMOND BURR BITS FOR ROTARY TOOLS USE ON CERAMICS, GLASS, TILES, PLASTIC, STEEL, WOOD ETC 3.17MM SHANK LENGTHS 40-50MM FOR POLISHING, DEBURRING & CUTTING NOT RECOMMENDED FOR SOFT METALS AS IT CLOGS THE DIAMOND PARTICLES INNER QUANTITY 25 CASE QUANTITY 100 FULL PRODUCT DIMENSIONS 20x9x3