This diagonal is a beauty! Its a 2" 45 degree Erecting Prism made from BAK4 prisms with anti-reflection coating and a clear aperture of 31 mm. The diagonal comes with a 2"- 1.25" adapter with build - in brass compression rings. This diagonal is extremely well-built.
This diagonal allows for comfortable 45 degree viewing and an upright view through your scope.
Williams is selling these for $168.95 plus shipping:
I'm selling this one for $110, shipped in the CONUS.
Thanks for looking,