Attwood Marine - Low Profile Adjustable Battery Tray - Series 27 - 90915. Heavy-duty, non-corrosive, black plastic. Includes adjustable-height crossbar and two retaining bolts. Meets ABYC Standard E-10 and USCG requirements. Patented design. Install with #10 screws. Contains no metal parts to corrode and no webbing straps to fade.