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The Master Lock No. 21KALN Laminated Steel Padlock, Keyed Alike – multiple locks open with the same key – features a 1-3/4in (44mm) wide reinforced laminated steel lock body providing extra strength and a 5-3/4in (150mm) tall, 5/16in (8mm) diameter hardened steel shackle for excellent cut resistance. Dual ball bearings locking for maximum pry resistance making it ideal for industrial applications and the rekeyable, 5-pin W27 cylinder helps prevent picking.