The Camco Battery Box is lightweight, heavy-duty box that ensures that your RV or marine battery is secure and protected. Designed with a lift-off lid, durable woven hold-down strap, foot clamps, and stainless-steel screws. Built to fit batteries group size 27, 30, and 31. Additional Features• Inside Dimensions = 7 ¼" Wide X 13 ¼" Long X 8 5/8" Tall with 2" additional head room for battery terminals• Meets USCG CFR 183.420 and ABYC E-10.7 specifications Helps secure & protect battery Fits group size 27, 30, & 31 batteries | Camco Battery Box, Large