Carlson's universal choke wrench is very simple, yet "tough" wrench will remove any choke with a slotted end.A key chain has been added to allow you to keep this wrench with you at all times.Made of heat treated stainless steel this wrench will not bend.It will fit 12 ga., 20 ga., 16 ga., 10 ga., and 28 ga.Choke systems.