All metal tamper-proof battery box. We recommend a Group 24 battery of at least 70 Ah for most areas. The battery box will accept batteries up to Group 27 dimensional size. Comes complete with all necessary hardware and mounting instructions. Internal dimensions 13.375″ x 9.375″ x 10″. Battery not included. Cabling not included, requires 155-2535-04 cable assembly, purchased separately.