The Master Lock No. 21 Laminated Steel Padlock features a 1-3/4in (44mm) wide reinforced laminated steel lock body providing extra strength and a 15/16in (24mm) 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.