These AR15/M16 pivot pins have a spring-loaded push button that, when pushed, retracts the stainless steel detents for easy pin removal. The housing, cap, button & detent balls are all constructed from Stainless Steel. The button also has a drilled cross hole which allows for the installation of a seal wire to prevent tampering with the guns internals. The pins are fitted with an end cap to simplify pin removal and installation and also prevents any debris from entering the internal parts of the pin. Includes (1) Push-Button Pivot Pin .250 Enhanced (Stainless Steel).