Camco 55372 Large Battery Box - Groups 27, 30 and 31 Includes lift-off lid, durable woven hold-down strap, foot clamps and stainless steel screws Lightweight, heavy-duty corrosion-resistant polypropylene box Fits group size 27, 30 and 31 batteries Inside Dimensions = 7  Wide X 13  Long X 8 5/8 Tall with 2 additonal head room for battery terminals Meets USCG CFR 183.420 and ABYC E-10.7 specifications