Master Lock used the toughest boron alloy material and cutting edge technology, registering over 40 patents, to create Excell: a truly high security padlock that is 50% stronger than a standard padlock. Laminated steel padlocks, available in different sizes for broader applications, are perfect for indoor and outdoor applications. Ideal for securing factory fences, sheds or store front gates. 45mm laminated steel core with Titanium reinforced outer body for higher strength and reliability. Exclusive octagonal boron-carbide shackle for maximum cut resistance. Double deadbolt locking for added protection from prying and hammering. 4-pin cylinder. Single pack.