The Stellarvue R130SET Heavy-Duty Dual Rings for SV/SVA130 Telescopes:
These are dual-hinged rings for the Stellarvue 130 mm refractors. Used on there SV/SVA130 refractors,these rings work with 5.5-inch outside diameter optical tubes. They are not sized for other telescope brands. The rings have five 1/84-20 threaded holes top and bottom. This includes a center hole, two holes that are 1.5-inches apart and two holes that are 60 mm apart.