The Master Lock #3KA laminated steel padlocks, keyed alike, multiple locks open with the same key, feature a 1-9/16 in reinforced laminated steel lock body providing extra strength and a 3/4 in tall, 9/32 in Dia 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, four-pin W1 cylinder helps prevent picking.