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Amazon [amazon.com] has DEWALT Double Ended Nut Driver (1/4″ + 5/16″) (DWADEND14516) for $4.09. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]Double ended for increased versatility[*]Detachable design allows for easy cleaning[*]Industrial-strength magnet maximizes fastener retention and allows for easy cleaning[*]Product designed for use in Impact Drivers