Individually keyed, solide case, padlock set with chain. Each padlock is made of 1-1/2-inch-wide zinc and copper alloy and has a pin tumbler. There is a master key for each quantity grouping and a grand master key for the entire set. Extra-long 3-inch shacklet on group of ten. Grand master keyed. Set includes thirty locks in sets of 15, 5, and 10 with extra-long shackle. Locks fully comply with U.S. Government standards AA59486 and AA59487.