Mustad Ultrapoint Stay-Lok Snaps are made to lock on even the most active catch. Once you have a fish hooked, the more it fights, the tighter the lock gets due to the unique double locking mechanism featured on this snap. These snaps are designed to stay locked, they will not pull open when you hook a fish. They are manufactured in the United States and made from strong stainless steel wire featuring a black nickel finish. Details: Manufactured in the United States, made from Stainless steel.