This Attwood Power Guard 27 Battery Box is for use with the battery series 27/27F/27M. Made with a polypropylene construction, this Attwood Battery Box has total acid resistance, allowing it to last. Featuring hold-down straps, instructions and mounting hardware, this marine battery box is easy to install. This Attwood Power Guard 27 Battery Box also has four cable openings, enlarged to .55" diameter, and a molded inside cover.