20mm Dowel to Shelving Fixture Clamp (x2 To be a spool holder)

A simple fixture to hold some wood dowel to shelving supports.
The dowel is used to hold spools above my printer.
The part goes into a 10mm slot in the bracket and a set screw goes through them both to hold them together.
The set-scews used were spares from when I built my printer they are 30mm long and the thread is 1/8-32 UNC.