Set of six hardened MICROMOT steel collets, one each at 1.0, 1.5, 2.0, 2.4, 3.0 and 3.2 mm, with a clamping nut and storage holder. Fits all Proxxon handheld MICROMOT machines except the Engraver GG 12. The triple-slit design holds its grip through repeated use, which Proxxon notes matters most for cutters with small shaft diameters. Proxxon NO 28940.