Norton Commando Roadholder Fork Collars
Set (2-off) of Norton Commando, 1970 onwards fork seal collars.
These collars included a recess above the fork thread to receive the rubber stanchion shroud/cover. Available with tightening/releasing holes (4-off at 90 degrees).
Note: Originally, without the tightening/releasing holes, tightening required a vice or similar gripping mechanism which would potentially damage any surface finish.