ER 11 Collet Set from Proxxon. 7 piece set includes 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 and 7.0mm. Each collet can be reduced to 0.5mm under the nominal diameter. M16 x 1mm pitch clamping nut included. Suitable for the main spindle of the FD 150/E. Supplied in a wooden box.