Molded Polypropylene Battery Box & Cover, Houses A Marine Battery Of Sizes BCI 27, 12"L x 6-3/4"W x 8-7/8"H, & BCI31, 13"L x 6-3/4"W x 9-1/2"H, Inside Has Ample Space For Battery Cable Hook Up, Vented To Allow The Escape Of Heat & Gases & Is Resistant To Battery Acid, Includes A Strap & Buckle To Secure The Lid Of The Box.