The Master Lock No. 6830 ProSeries® Solid Body Padlock features a 1-9/16in (40mm) wide solid brass body to provide extra resistance in caustic, corrosive environments and a 1-1/16in (27mm) tall, 1/4in (6mm) 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.