Vixen White 115mm Tube Rings, Slip on Style.
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Tube Ring Pair White Slip-on ID: 115mm fits Vixen 102M, ED 102S, ED 102SS, and FL102S telescopes. Its weighs is 12.3 oz. (350 grams)
Tube rings and accessory mount rings clamp onto telescope tubes to provide mounting points for accessories and mount heads. Ring models are designated by their inside diameter. Both types can be joined by Dovetail tube plates on the bottom for attachment to Porta, GP-Series and SPHINX (SX) mounts.
Tube Rings are sold in pairs and have 1/4"-20 threaded holes on top and bottom. There are two style of Vixen Tube rings: a "hinge-style" and "slip-on" style. Anoptional Tube Ring Accessory plate can be fit across the top of the rings for additional mounting options and greater stability.