This is a simple aluminum plate used in aiding the set up of our O-Ring tool. This plate is used to clamp the O-ring tool to and double check your set up before cutting actual engine parts. A cost effective way to gain confidence on you skill of using and setting up the tool.
Typically two C-clamps are used to hold the cutter body to the plate. This allows it to be moved all over the plate on both sides so many set ups can be tested.