This is a tool to align the clutch when installing it to the flywheel. It aligns the clutchplate against the pressureplate. There is 3 different sizes of expanders to fit diffent clutches.

You need 1 M8 bolt that is 120mm long and one M8 nut. 

Put the little cone on the bolt. Put the tool on the clutch and tighten the expander so i locks in to clutchplate and thread the big cone against the pressureplate and it should be centered.