15mm ID with 30mm x 1.0 right hand threads.
This adaptor is for 13, 14 & 15 tooth freewheel Sprockets with the 30mm x 1.0 thread pitch.
1/2" wide has a 4mm key way the flange is .084" wide.
The key is NOT included.
CNC machined in OKLAHOMA. Made out of 12L14 Steel, Zinc Plated.
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