40mm Brass Body Padlock with Hardened Steel Shackle Order multiple locks to use the same key (Keyed Alike), Key# 3231 1/4in (6mm) Diameter Shackle The Master Lock No. 4140KA 3231 Economy Padlock, Keyed Alike – multiple locks open with the same key – features a 1-1/2in (38mm) wide brass body to resist the elements and a 13/16in (20mm) tall, 1/4in (6mm) diameter hardened steel shackle for excellent cut resistance. Ideal for cabinets & fences, the non-rekeyable 4-pin tumbler cylinder provides greater pick resistance.