The Master Lock No. 7030KALT ProSeries® Solid Body Padlock, keyed alike – multiple locks open with the same key – features a 1-9/16in (40mm) heavy hardened steel body with chrome rustproofing and a 3in (76mm) 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.