Battle Arms Development Enhanced Pin Set consists of the Enhanced Take-down Pin (BAD-ETP) and Enhanced Pivot Pin (BAD-EPP). Precision Swiss CNC machined from round stock steel bars, the BAD-ETP & BAD-EPP are case hardened and finished in mil-spec black manganese phosphate. Each BAD-EPS comes with (1) BAD-ETP, (1) BAD-EPP, (2) KNS hardened stainless steel detents, (2) 17-7 nickel plated stainless steel pin springs, and (1) high-strength neodymium magnet for hassle free magnet assisted installation of the Enhanced Pivot Pin (BAD-EPP). FeaturesFits all AR15/M16/M4 lower receivers with mil-spec .250in diameter front pivot and rear take-down pin holes.Patent Pending Pivot Pin & Take-down Pin Head Designs - Greatly improved gripping surface and pull strength without the use of oversize heads.Low Profile Pin Heads - Low drag and never in the way. Lower profile than mil-spec pin heads.Ambidextrous Safety Compatible - The Enhanced Take down Pin (BAD-ETP) head design does not obstruct the us...