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The Proxxon Steel Collets fit all MICROMOT rotary tools, except the Engraver GG 12. Six total pieces ranging in size from 1/32", 1/16", 5/64", 3/32", 7/64" and 1/8" (1.0, 1.5, 2.0, 2.4, 3.0 and 3.2 mm) come as a set in a practical holder for storage along with one clamping nut.