Clutch (Single and Twin-disc) Sinter Clutch Single disc Ø185 with 4 riveted pads of high quality “cera metall”. Spline hole Ford 1″ z23. The hub is fixed with 12 steel rivets. Sinter Clutch “compact” Twin disc’s Ø185 wiyh 6 sintered pads of high quality “cera metall”. Spline hole Ford 1″ z23. The hub’s is fixed with 8 steel rivets. The front hub have recess to for the rear hub to make a compact unit together.