Standard Battery Hold-Down Tray safely holds group 24/24M automotive batteries. Large Battery Hold-Down Tray safely holds group 27, 30 and 31 automotive, RV and marine batteries to prevent movement during transportation. The Standard tray will fit batteries up to 11-1/8" (L) x 6-3/4" (W) x 8" (H). The Large tray will fit batteries up to 12-11/16" (L) x 6-3/4" (W) x 8-3/4" (H). Standard measures 11-9/16" (L) x 8-1/2" (W) x 9-5/8" (H). Large measures 13-1/8" (L) x 8-1/2" (W) x 10-3/8" (H)and is constructed of heavy-duty, acid-resistant plastic with stainless steel hardware. Includes (1) tray, (2) rods, (1) cross bar and knobs. This product meets U.S. Coast Guard CFR 183.420 and ABYC E-10.7 specifications when used with group 24/24M 27, 30 and 31 batteries. Patented.