The Master Lock No. 4KAB 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 brass shackle provides superior corrosion resistance. Dual ball bearings locking for maximum 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.