Makes installing or changing AR trigger guards quick and easy.COMES WITH AN INSTALL PIN AND AN UN-INSTALL PINPRECISELY CONTROL AND INSTALL THE TRIGGER GUARD ROLL PIN TO PREVENT DAMAGE TO THE RECEIVERPINS CONVENIENTLY STORE IN THE FRAMETHE OLD METHOD OF HAMMERING THE ROLL PIN INTO THE RECEIVER CAN EASILY DAMAGE YOUR SERIALIZED LOWERDURABLE CONSTRUCTION, MADE OF ALUMINUM WITH A MIL-SPEC ANODIZED FINISH