Attwood Marine Battery Tray with Adjustable Hold Downs Lightweight, heavy duty corrosion-resistant polypropylene, non-corrosive black plastic. Includes adjustable-height crossbar and two retaining bolts. Attwood Marines hold-down trays are designed to secure your battery. Meets ABYC Standard E-10 and U.S. Coast Guard requirements. Patented design. Install with 10 screws. It fits most 24 Series batteries. Constructed from non-corrosive hi-strength plastic, this battery tray holder measures approx