JET Locking U-Joint Adaptor, 3/8" X 1/4" (681917)

Locking U-Joint AdaptorSocket is made of the finest quality S.A.E. 4140 Chrome Molybdenum high-impact steelPatented 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 failuresDrive anvil locks into straight position when flex function is not requiredCan be left on impact wrench and engaged only when neededPatented design combines drive adaptor and universal joint into one handy tool