The Master Lock No. 4KA Laminated Brass Padlock, Keyed Alike – multiple locks open with the same key - features a 1-9/16in (40mm) wide laminated brass body offering excellent corrosion resistance, making this lock ideal for marine and other harsh environments. The 3/4in (19mm) tall, 9/32in (7mm) diameter hardened steel shackle provides excellent cut resistance. Dual locking levers provide extra pry resistance and the 4-pin W1 cylinder helps prevent picking. Keyed alike padlocks available to order to match other locks with the W1 cylinder.