the right choice for creative hobbyists and model makers. the rotary tool micromot 50/e comes in this set with 6 high precision triple slit steel collets in sizes 1/32", 1/16", 5/64", 3/32", 7/64" and 1/8" (1.0, 1.5, 2.0, 2.4, 3.0 and 3.2mm) which ensure accurate clamping of the bits for highest concentricity and the precision you need for finest work pieces. This kit includes an ac adapter (12 – 18v, 1.0a) and a selection of 34 useful bits (1 diamond grinding bit, 1 fine cutter, 1/64" and 1/32" (0.5 and 1.0mm) micro-drills, 1 brass brush, 4 aluminum-oxide grinding bits (cylinder, sphere, disc and cone shaped), 1 spring steel saw blade, 4 grinding wheels 7/8" x 7/64" (22 x 3mm), 2 each aluminum-oxide and silicon carbide, 20 cutting discs and 1 mandrel.