The Rise Armament Anti-Walk Hammer, Trigger Pins are small .154" pins for your AR-15. It's recommended to use 8 inch-pounds of torque, no more than 11 inch-pounds when installing the screws. Set of 2 pins and 4 screws.
The external width of AR receivers varies in the trigger/hammer pin area, depending on the manufacturer. If the pins are too long for your receiver, you may shorten the pins a small amount by carefully filing material evenly from both ends of the pins. However, this is not required. Longer pins will not affect the function or performance of the rifle.