Attwood Power Guard 27 Battery Box, Inside Dimensions 13-7/8"L x 7-1/4"W x 10-1/2"H, Outside Dimensions 16-7/8"L x 9-5/8"W x 10-7/8"H, Black, Vented. For series 27 batteries. Battery boxes meet ABYC Standard E-10 and U.S. Coast Guard Specification Number 183.420 as an OEM-installed battery hold-down system. Polypropylene construction for total acid resistance. Hold-down straps resist 350 pounds of force, nearly four times the USCG requirement. Battery boxes are drop tested in temperatures ranging from -20?F to +120?F. Mounting hardware is included.