Iron base sintered metal, tapered body w/72 equally spaced serrations along lg, 0.562 in. Od one end, 0.653 in. Od other end, 0.468 in. Lg, w/centrally located tapered oval hole through lg, 0.197 in. W by 0.314 in. Lg one end, 0.285 in. W by 0.314 in. Lg other end