Bicycles
Vortex Cantilever Ring Mount for 1-Inch Tube with 2-Inch Offset
Vortex Optics Cantilever Ring Mount for 1-Inch Tube with 2-Inch Offset (1.59 Inch / 40.39 mm) 102
https://www.bizrate.co.uk/bicycles/vortex-cantilever-ring-mount-for-oid6711979630.html