The Grainger keyed alike long shackle padlocks are made of solid brass for strength and durability. They feature a 1-3/4" wide shackle that provides more room to secure larger items. The padlocks have a 5-pin tumbler mechanism for pick resistance. They are available keyed alike so multiple locks can use the same key. These long shackle padlocks are ideal for securing gates, storage units, tool boxes, and more. They meet ASTM F883 Grade 4 standards for security.