18 mm ID (.7085") x .9" wide Adaptor for freewheel Sprockets has two 6 mm x 1.0 set screws & 6 mm key way.
CNC machined out of 12L14 steel and Zinc Plated.
You may want to look at the part below!
2 to 1 Gearbox with 18 mm shaft Powered with YOUR drill
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