The No. 7040KALN from Master Lock Keyed Alike - order multiple locks to open with the same key or order to match other locks with the ProSeries Padlocks are designed for Commercial/Industrial applications 1-3/4" (44mm) heavy hardened steel body with chrome rustproofing for high security with long life 5-5/8" (143mm) tall, 5/16" (8mm) diameter hardened boron alloy shackle for superior cut resistance Dual ball locking mechanism resists pulling and prying