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Amazon [amazon.com] has 3-Pc Klein Tools Impact Swivel Socket Adapter Set (1/4″, 3/8″, 1/2″ Square Drive) for $11.97. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]3-PIECE SWIVEL ADAPTER SET: Impact driver to 1/4, 3/8, and 1/2-Inch square drives for versatile socket compatibility[*]20-DEGREE SWIVEL DESIGN: Provides optimized access in tight or hard-to-reach spaces with 360-Degree rotation capability