The KNS Generation ST pin sets that were designed for the Spike's Tactical Compressor Rifle Series. These are the Strongest pins that can be produced and were designed to withstand the high impact of full and semi-auto 9mm, .223, and 7.62mm suppressed weapons. The pins are stainless steel.An absolute must-have for all M-16 owners. They will also protect your AR-15. Special anti-creep retainers prevent wear on your irreplaceable M-16 or AR-15 receiver. Pin installation tool & 2 Torx wrenches included. No modification to firearm required.NoteThe torque spec on the screw is 11 inch/lbs. Maximum. We recommend 8inch/lbs. of torque. The external width of some AR receivers may vary in the trigger/hammer pin area depending on the manufacturer. The pins being slightly too long will not affect the function or performance.