SEACHOICE 22011 Battery Tray with Hold Down Strap Group 29/31 Battery tray with quick-disconnect buckle secures a single group 29 or 31 battery Size: 13 inch x 7-1/8 inch x 1 inch Ideal for applications that do not require batteries to be completely encased. Meets U.S. Coast Guard regulations Includes mounting screws and gasket