4outside dia. 0.350 p or m 0.005 in., length 0.657 in. P or m 0.002, matl al qq-a-225/8 tem t6, plate nickel per mil-c-26074 cl 1 0.0005 thk followed by gold mil-g-45204 type 1 gr cl 2 0.00012 thk, p/n is differentiated by inside diameter of the cylinder