The master lock No. 5KA laminated steel Padlock, keyed alike - multiple locks open with the same key features a 55 mm reinforced laminated steel lock body providing extra strength and a 26 mm tall, 9 mm Dia hardened steel shackle for excellent cut resistance. The ball bearing locking mechanism provide extra 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.