11mm ID with 4mm key way x .75" wide Adapter for freewheel sprockets with 16 teeth & up that have 1.375 x 24 tpi OD CW - right hand threads.
These will have a half round keyway cut that works great with your 4 mm square key.
( 11 mm with 4 mm )
May be used with some: eZip, Currie Technologies Electric Bike Motor, iZip gear reduction motor so they can freewheel. MY1018, MY1018z, Unite, XYD-16
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