JET Socket U-Joint Adapters, 3/8" X 1/2", Impact (681918)

Impact Socket U-Joint AdaptersSockets made of the finest quality S.A.E. 4140 Chrome Molybdenum high impact steelMeets or exceeds U.S. Federal Specs: GGG-W-660A and ANSI specificationsPatented hex ball and socket design eliminates connecting pin for increased safetyBall and socket distributes force evenly for greater torque and longer lifeEliminates broken connecting pins, the major source of U joint failures