Padlock application: Ideal to secure boats and gates in a marine environment Maximum protection: Laminated steel core with stainless steel body cover and top and bottom plates for exceptional weatherability High security application: 4-pin cylinder for increased pick resistance and a tough-cut octagonal boron-carbide chrome plated shackle for excellent rust resistance Durable design: Padlock has a dual ball bearing locking for maximum Pry resistance and a covered keyway and shackle seals for added weather protection Specifications: Features a 51mm wide lock body with an 10mm diameter shackle that is 25mm long; includes 4 keys Limited lifetime warranty