One replacement 1-3/8" X 6 spline clutch hub for PTO slip clutches, replaces 160 mm diameter clutch hubs that use four friction disc, will not fit 2 friction disc units. These are new OEM take off clutch hubs. Designed to mount via two cinch bolts. Specifcations: OD: 160mm or 6.29" ID: 35mm (1-3/8") with 6 splines Fits Eurocardan FD4 Series Clutches.