Billet Aluminum Optima Battery Tray (Group 34/78) - Textured Black Powder Coat - SMOOTH TOP TRAY Machined from 5/16 inches thick 6061-T6 aluminum and powder coated in a durable semi-gloss textured black finish. Stainless Steel ASSEMBLY hardware included. Each standoff is machined from 1/2 inches diameter aluminum tubing. Accommodates (4) post GROUP 34/78 Yellow, Red and Blue Top Optima Batteries as well as any battery that fits within the listed dimensions. Dimensions of pocket that houses battery:Length = 10 inches Width = 6 13/16 inches Height = 6 3/4 inches