The Master Lock number 3KA laminated steel padlocks, keyed alike multiple locks open with the same key feature a 1-9/16 inch (40 millimeter) reinforced laminated steel lock body providing extra strength and a 3/4 inch (19 millimeter) tall, 9/32 inch (7 millimeter) diameter hardened steel shackle for excellent cut resistance. The non-rekeyable, 4-pin W1 cylinder helps prevent picking. Keyed alike padlocks available to order to match other locks with the W1 cylinder.