This will probably be the last barrel nut wrench you will buy. Made from 3/8” thick steel bar and hardened steel dowel pins. Fits over barrels 1.075” diameter and smaller. The short pin side is for standard steel barrel nuts and the long pin side for aluminum nuts. Use with a 3/8” or ½” breaker bar or ratchet.
**AR10 side fits nuts with 1.720 gas tube hole center to center distance.