Master Lock Marine Padlocks are designed to provide optimum protection in highly corrosive environments e.g. near the sea/coast where there is persistent salt spray.The padlock is key retaining, has a 4-pin cylinder and is supplied with a Lifetime Warranty against mechanical failure. Suggested Uses: Marine equipment, outboard motors, tackle boxes and trunks.The Master Lock 640EURDLH has the following specifications: 40mm nickel plated solid brass marine padlock - 51mm stainless steel shackle, 6mm diameter - 4-pins - Key retaining.