attwood 9091-5 USCG-Approved 27 Series Adjustable Hold-Down Marine Boat Battery Tray, Black Heavy-duty,non-corrosive black plastic12-1/8" x 6-3/4" x 8-3/4"27/27M batty series Heavy-duty, non-corrosive black plastic Install with number 10 screwsMeets ABYC standard E-10 and U.S. coast guard requirements Includes adjustable-height crossbar and two retaining bolts