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. These stainless steel Excell padlocks are designed with a shrouded shackle for a better resistance against prying attacks. Ideal for securing factory fences, sheds or store front gates. 70mm stainless steel body for corrosion resistance. Exclusive octagonal boron-carbide shackle for maximum cut resistance. Double deadbolt locking for added protection from prying and hammering. 4-pin cylinder. Covered keyway for better protection against dust and water.