This is the dropped 1-3/4" bolt in driveshaft tunnel brace to replace the factory stamped steel piece for use with larger aftermarket exhaust. Made of steel and powder coated. Unbolt you factoy brace and bolt in. Designed to strenthen the driveshaft tunnel.  
Fits 2008-2009 Pontiac G8 and 2010-2014 Chevy Camaro