Sunex 216fp 1/2-Inch Drive 1/2-Inch Female Pipe Plug Socket
Sunex 214fp 1/2-Inch Drive 7/16-Inch Female Pipe Plug Socket
Yakamoz Quick Release 1/2-Inch Square Drive to 1/4-Inch Hex Female Socket Adapter Converter Chuck Adaptor for Impact and Ratchet Wrenches
Sunex 310EPC 3/8-Inch Drive 5/16-Inch Female Pipe Plug Socket
Sunex 308EPC 3/8-Inch Drive 1/4-Inch Female Pipe Plug Socket
IRWIN 1869511 Impact Performance Series Square Drive to Hex Shank Socket Adapter, 1/4-Inch Square to 1/4-Inch Hex
Proto Impact Socket Adapters, 1 in (female square); 3/4 in (male square) drive, 2 7/8"
Here is a review of the not very common but very useful Square socket set
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