Master Lock Heavy Duty Outdoor Keyed Padlock, 1-3/4-in Wide x 1-1/16-in Shackle The Master Lock no. 6840 Pro series solid body padlock features a 1-3/4in (44mm) wide solid brass body to provide extra resistance in caustic, corrosive environments and a 1-3/16in (30mm) tall, 5/16in (8mm) diameter hardened boron alloy shackle for superior cut resistance. Designed for commercial/industrial applications, a dual ball locking mechanism resists pulling and prying and a high security, rekeyable 5-pin cylinder with spool pins is virtually impossible to pick. Pro series padlocks are designed for commercial/industrial applications 1-3/4 in wide brass body provides extra corrosion resistance in caustic, corrosive, salty environments 1-3/16in (30mm) tall, 5/16in (8mm) diameter hardened boron alloy shackle for superior cut resistance Dual ball locking mechanism resists pulling and prying High security, rekeyable 5-pin cylinder with spool pins is virtually impossible to pick We have two locks on hand that are keyed alike. If there is only one left there is no assurance that we can get a similar keyed lock in quickly.