The Master Lock No. 3KALF Laminated Steel Padlocks, Keyed Alike - multiple locks open with the same key - feature a 1-9/16in (40mm) reinforced laminated steel lock body providing extra strength and a 1-1/2in (38mm) tall, 9/32in (7mm) diameter hardened steel shackle for excellent cut resistance. Dual ball bearings locking for maximum pry resistance making it ideal for industrial applications and the non-rekeyable, 4-pin W1 cylinder helps prevent picking. Keyed alike padlocks available to order to match other locks with the W1 cylinder.