Attwood Battery Boxes meet ABYC Standard E-10 and U.S. Coast Guard Specification number 183.420 as OEM-installed battery hold-down systems. Hold-down straps resist 350 lbs. of force, nearly four times the USCG requirement. Polypropylene construction for total acid resistance. Drop tested in temperatures ranging from -20F to +120F. Mounting hardware is included. Large handles with rolled edges. Vented. Available: Power Guard 24 Box Four cable openings with a 0.55 dia. Instructions molded inside cover. For 24 series batteries. Inside: 11.13L x 7.75W x 10.13H. Outside: 14L x 9.63W x 10.63H. Power Guard 27 Box Four cable openings with a 0.55 dia. Instructions molded inside cover. For 27 series batteries. Inside: 13.88L x 7.25W x 10.5H. Outside: 16.88L x 9.63W x 10.88H. Power Guard 31 Box Eight cable openings. For large applications (9.75 max battery height). Inside: 15.48L x 7.13W x 9.75H. Outside: 18.75L x 9.25W x 10.25H. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Size: 31. Type: Battery Boxes.