Matl aluminum alloy qq-a-354 cond t, 0.245 to 0.250 in. O/a diameter by 0.312 in. O/a lg, right end 0.125 in. Lg, left end begin w/0.010 in. Radius to 0.157 to 0.160 in. Od and tapers to a smaller end diameter at 4 degrees angle, right end concaved 0.130 porm 0.005 in. Radius by 0.063 in. Deep