This Winchester manufactured second variation trigger pin (.065" diameter) is for the second variation model 37 Steelbilt single barrel shotgun in 12 and 16 gauge only and uses the second variation trigger. This pin is in very good condition with light wear. NOTE: The second variation model 37 frame supports three smaller .065" diameter pins (trigger pin, cocking lever pin, and locking spring guide rod stop pin) along the lower tang instead of only two slightly larger .080" diameter pins (trigger pin and cocking lever pin) which are used on the earlier first variation frames. (file photo)