V-grooved post make sure the azimuth sustained while the elevation be adjusted. And the azimuth also can be designated with the thumbscrew in the bottom of holder.

►  Posts and Holders available in 0.5 inch (12.7mm) and 0.7 inch (18mm) diameter.

►  V-groove prevents Post from turning in Holder while adjusting elevation.

► Bottom of Holder can be rotated 360˚ and locked for optical axis alignment.