This tool has been designed to fit the three main bolts on a standard C-clamp (newer and older) used on par and leko lights. There is a pin splitter on the right side designed to fit 20 - 60 amp bates connectors. The most powerful feature on this tool is its continuity checker on the right side. This testing device can test Edison, Stage Pin and Twist and more. You can also test loose lamps and fuses.