This collet set consists of 18 collets with a clamping range of 2-20mm. In addition, a MK2 / M10 ER32 collet chuck and a matching union nut hook wrench are included. Both the collet chuck and the collets are hardened and ground. The collets are made of 65Mn spring steel, the collet chuck is made of Cr40 steel. With an open-end wrench with a spanner width of 36 mm, the union nut can be tightened professionally. Two milling surfaces are attached to the collet holder for counter-holding. The system accuracy when the collet is inserted is 0.012 mm. The set is delivered in an aluminium case with foam insert for practical and safe storage.