This is a heavy duty dual battery tray for the 81-91 Chevy Square Body core support, mounts on the driver's side.  It is fabricated from laser cut 1/8 cold rolled steel, it holds two Odyssey AGM34/78 batteries (or other group 34 batteries).  Mild hammering of the inner fender is required for hood clearance, and the welding of one mounting tab is required.  It is shipped in raw steel with grade 8 hardware, it will need to be painted or otherwise coated to prevent rusting.  Made in the USA!