Extreme Engineering Ultra LiteSpeed Hammer Set includes a Ultra Low Mass Sear, LiteSpeed Hammer, and Race Disconnector. This kit is designed to be used for extremely light trigger pulls. Faster reset time due to low mass components which reduces chances of following with very light trigger pulls. The sear bearing surface is micro honed to produce that 2 lb. pull easily. Heat treated to 53-56 Rockwell C for extreme durability. Out lasts all other kits now on the market. Fits all 1911/2011 formats.