10 general purpose coil-type hammer springs for use in over & under shotguns are provided in this pak. Springs are designed to replace broken or weakened original hammer springs in foreign make over & under shotguns imparting faster lock-time with positive ignition. All springs are designed to function on 2.85mm (0.112") and larger guide diameters. There are 5 spring designs with 2 of each supplied. All springs have extra coils to permit fitting.