This tool is a must have in the pits, shop etc. to insure that the blower manifold is flat. There is no quicker way to ruin a fresh blower or a brand new blower by installing it on a wavy intake manifold.
The surface plate is made from 1.00" thick billet aluminum and has two easy to grip handles to do the lapping. It uses replaceable sand paper on the surfacing face.
Keep in mind this is to be done once the blower manifold is installed on the engine.