Wheeler Delta Series AR Pivot Pin Install Tool is for the AR-15, M4 or M16. It makes the pivot spring and detent work fast and effortless. This pivot pin has a Poll Pin Punch and starter for all lower receiver roll pins. It comes with a handy key ring for storage and is made of black zinc plated steel.Specifications and Features: Manufacturer Number: 156243 For the AR-15, M4 or M-16 Makes pivot spring and detent work fast and effortless Roll Pin Punch and starter for all lower receiver roll pins Comes with handy key ring for storage Black zinc plated steel