Universal Pen Mandrel allows the majority of pen kits to be turned on a single mandrel. The adjustable shaft length enables you to turn one or two pen components at a time. Each kit is supplied complete with 3 parallel spacers for turning pens with an outside diameter of 7mm and 4 cones for barrel diameters of 7.5-12mm. The cones have a 90deg included angle which will not mouth the barrel or cause any other damage in normal use. Now supplied with additional lock nut kit for use with larger blanks.