PKM-CL is a slip-on pen mandrel for a 5/8" Lathe Headstock Spindle. For Shop smith lathes. 7mm mandrel shaft (.244" OD). Also includes (7) 7mm bushings, (1) knurled nut, (1) 7mm Brad Point drill bit, and (1) Allen Wrench for the set screw to lock on the spindle. Replacement shafts (XPKM-ELC2) are available from Penn State Industries. PSI Woodworking Mandrel Savers (PKMSTS1 & PKMSTS2) are compatible with this shaft. PSI Woodworking has many other mandrels available to meet your specific turning needs: PKMS2SET, PKMS1SET, PKM-ELC, PKM-FLC, PKM-FSM, PKMSMAN1, PKMSMAN2, PKM-AL, PKM-BL, PKMBCM1, PKMBCM2, PKMBCM3.