Farpoint V Size Dovetail Ring Set with 90mm Rings, FVDR90 V Size (Vixen) Dovetail Ring Set, 90mm rings For telescope tubes up to 85mm in diameter Includes (1) 8" long V size Dovetail Bar, (2) 90mm I.D. Rings, Mounting Hardware "V" Size Compatible with Vixen Made in the USA by Farpoint Astro