Attwood Heavy-Duty All-Plastic Adjustable Battery Tray - 27 SeriesHeavy Duty All Plastic Adjustable Battery Tray 27 Series All plastic and heavy duty, these battery trays use an adjustable cross bar and posts to allow for universal fit of both short and tall battery styles. Contain no metal parts to corrode and no webbing straps to fade Ergonomic nuts and bolts easily secure batteries These battery trays are all plastic and heavy duty designs, using adjustable crossbars and columns to accommodate general purpose