Some pins just don't fit very well, they wobble, fall out, or worse. AR-Stoner has the solution, the Anti-Rotation Hammer and Trigger Pin Set. These pins are created to prevent the pin from walking out, or vibrating, which can cause damage to your receiver. The included brass "nose" aids in installation in tight spots.Features:Anti-Rotation Locking Cam PinsReplaces Trigger/Hammer PinsAllen Key Included