The Master Lock No. 7040 ProSeries® Solid Body Padlock features a 1-3/4in (44mm) heavy hardened steel body with chrome rustproofing 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.