Stellarvue cnc machined, dual hinged rings for our 140 and 152 mm refractors. Used on our SVX140 and SVX152 refractors, these rings work with 6" O.D. tubes. They are not sized for other brand telescopes. The rings have five 1/4-20 threaded holes top and bottom. This includes a center hole, two holes that are 1.5” apart and two holes that are 60 mm apart.
This is a new design with 3/4" wide recesses cnc machined on the inside facing surfaces. This is a much more expensive way to machine rings. Using thicker felt that is applied within these recesses, the felt does not tend to migrate as it does on conventional rings when exposed to varying temperatures and humidity.