Individually keyed, solid case, padlock set with chain. Each padlocks is made of 1-1/2-inch-wide zinc and copper alloy and has a pin tumblers with dead bolt locking construction. There is a master key for each quantity grouping and a grand master key for the entrie set. Set includes thirty locks grouped in sets of 15, 10, and 5. Locks fully comply with U.S. Government standards AA59486 and AA59487.