Kit #12 Consists of 18 "U" shaped round wire springs (illustrated at right) for use as top lever springs in many double-barrel shotguns. The spring wire is 0.098" in diameter which is normally a universal size, is pre-tempered and requires no heat treating. Springs are of 1 design and must be shaped and fitted as required.

Blitzpak #12 Consists of a total of 9 wire-type top lever springs as described in Kit #12 above.