Used on a/a49e22 ar. 3.00" overall length pivot bolt item appears like a bolt, sholder but has two different sizes of thread as follows: grip is 1.87 unthreaded x 1.0 in diameter. threaded portion of sholder is 1.00-12 unf-2a, 1.13 in thread length. smaller diameter of threaded shaft is 0.75-16unf-2a, 1.42 in of thread length. head is hex 1.5" across flats oxide surface treated
