1/2″ Drive 3-Piece Locking Impact Extension Set SIZES: 3″ .5″. 10″ PROTO J7515 USA Impact Socket SetsDesigned to withstand the high impacting torque loads that modern impact wrenches produce. Impact sockets are heat treated to a lower hardness than hand or power sockets to ensure durability for impact applications.Always use retaining rings and pins for impact sockets with 3/4″ drive and larger Click Here. Double your traffic. Get Vendio Gallery – Now FREE!