2steel, anodized black; one end thd, 1 in. 14-rh thd, 0.281 in. Thd, external thd, 0.750 in. Id, 0.469 in. Deep; other end chamfered, 45 degrees angle, 0.047 in. Deep, 0.500 in. Id, inside corner chamfered at 45 deg; center section 0.906 in. Od, 0.312 in. Lg