New generation 2 pin sets now available. These are the strongest pins that can be made and were designed to withstand the high impact of full auto and semi-auto 9mm and supressed .223 WEAPONS. Sizes: Small .154 diameter 416 Stainless steel pins. End retainers are black oxide. Connectors have phosphate finish. Trigger and hammer pins with lubrication ports and E-Z installation tool. An absolute must-have for all AR-15 / M-16 owners. Special anti-creep retainers prevent all wear on your M-16 or AR-15 receiver. Anti-creep retainers removable for lubricant injection. Pin installation tool and 2 allen wrenches included. No modification to gun required.