Collet holders PM ER32 pneumatic Pneumatical clamping / release. VLK 50 ER25 Mini collet holder Mini collet holder for ER25 (429E) collet. SHG – with outer thread For internal clamping of bushings and collars etc. SH Rapid clamping with Schaublin Type B and W pull-type collets. PM-00 Short-stroke cylinder Pneumatic / hydraulic – for more rapid cycles and a greater clamping force: at 6 bar 1000 N. PM Relay valve The device consists of a dual-action pneumatic piston and an oil piston positioned on the same axis. PM-100 Short-stroke cylinder Pneumatic – for more rapid cycles and a greater clamping force: at 6 bar 4000 N.