Ensures that the balancer is locked in position as the crankshaft flexes and twists Rated at 200, 000 PSI, which is considerably stronger than Grade 8 hardware Compact and extra tall 12-point head eliminates the worry of stripping the head by accepting a deep socket Features an under head length of 1.580, diameter/thread size of 5/8 -18, and a socket size of 5/8" Includes a wide area washer that is 1/4" thick