Master lock marine padlocks are designed to provide optimum protection in highly corrosive environments eg near the seacoast where there is persistent salt spray the shrouded shackle design offers additional protection the padlock has a high security reversible key and is key retaining it has a 5 pin cylinder and is supplied with a lifetime warranty against mechanical failure suggested uses marine equipment outboard motors tackle boxes and trunks specification size 50mm shackle height 22mm shack