This set contains the parts needed to attain crisp, precise trigger pull for a 1911. This set is specifically prepped and matched to give a 3.5 lb. trigger pull without any stoning of the sear or hammer. The sear spring will need to be properly tensioned for your specific pistol. Recommended for target use only. This set incorporates Cylinder & Slide's Match Hammer, Super Lite Low Mass Sear, Disconnector, along with the Light Pull Sear Spring and Reduced Power Mainspring. Each part has been heat treated for long life and durability. Requires fitting and installation by a qualified gunsmith. Kit Includes: Match Hammer Super Lite Low Mass Sear Disconnector Light Pull Sear Spring Reduced Power Mainspring