Eaz-Lifts Trailer Safety Chain and 7-Way Plug/Cable Storage helps keep your trailer chains and harness off the ground when your trailer is parked or in storage. This product fits 3 bolt, A-frame style tongue jacks. It attaches using the existing 3/8-inch front bolt on your tongue jack and requires a 9/16-inch wrench for installation. Once installed, it holds your 7-way plug angled down to help avoid water damage. This product measures 5 ¼-inches (L) x 6 11/16-inches (W) x 3 11/32-inches (D) and is constructed of durable aluminum.