DCA 2PCS 1/2 inch Square Drive to 1/4 inch Hex Female Socket Adapter Converter Chuck Adapter for Impact Air and Electric Wrench - Amazon.com
U.S. Solid 2pcs Brass Pipe Fitting Adapter, Male Pipe x Female Pipe, 1/2" x 1/
WoodRiver 2-1/4" to 1 1/2'' Adaptor - Vacuum And Dust Collector Accessories - Amazon.com
2" to 1-1/4" Hitch Adapter
DeWALT DW2547IR 1/4 in. Hex Shank to 1/2 in. Socket Adapter (Impact Ready) at Tractor Supply Co.
316 Stainless Steel, 1/2 in x 1/4 in Fitting Pipe Size, Reducing Adapter - 1DFY3|8-4 RA-SS - Grainger
Brass, 1/2 in x 1/4 in Fitting Pipe Size, Reducing Adapter - 46M452|706120-0804 - Grainger
Proline Series 1/4-in x 1/2-in Threaded Male Adapter Bushing Fitting in the Brass Fittings department at Lowes.com
3/4" Male x 1/4" Female NPT Hex Bushing Adapter Pipe Reducer Brass Fit – compressor-source
LTWFITTING 1/2 in. FIP x 1/4 in. MIP Brass Pipe Adapter Fitting (5-Pack) HF1028405 - The Home Depot
2" to 1-1/4" Hitch Reducer | Discount Ramps
Amazon.com: Universal Vacuum Hose Adapter 2-1/2 Inch to 1-1/4 Inch,1-1/4 Inch to 1-3/8 Inch to 1-1/2 Inch,1-3/8 Inch to 1-1/4 Inch Wet Dry Vacuum Converter Reducer Attachment Adapter kit for Vacuum Cleaner(6pcs) :
Amazon.com: Universal 2.25" ID 2.5" ID Exhaust Pipe Adapter Connector Reducer 304 Stainless Steel 2.25 Inch to 2.5 Inch 2 1/4” ID to 2 1/2” ID kit : Everything Else
Impact Socket Adapter Set, PTSLKHN 3 PCS | 1/4", 3/8", 1/2" Drive, Socket Adapter for Drill, 3/8 to 1/2 Socket Adapter, 3/8 to 1/4 Socket Adapter, Adaptation to High Torque Impact Wrenches - Amazon.com