Nowlin Action Kits are designed to improve the overall quality of your 1911 trigger pull. Each kit includes a disconnect, 19-1/2 lb main spring, a sear spring, hammer and sear. These kits give you a smooth 3-1/2 to 4 lb trigger pull with no creep. Kits require fitting and installation by a qualified gunsmith. Kit Includes: Commander style, S-7 machined tool steel hammerPre-tuned sear springHeat treated and specially honed sear19.5 lb main springDisconnector