The best designed 4-coil system on the market. The double torsion springs are made from the highest quality music wire available. the spring pin is made from high tensile steel and will not bend. Heavy spring lock included. Kit #2 fits #3 Victor Round and Square jaw (with 2-7/8" pin), #3 Victor Soft Catch, #3 Duke, Victor #4 Coyote 2x2 (with 2-7/8" pin). 1 kit for 1 trap