1.25 inch T2 T Ring Adapter Lens Mount Telescope M42*0.75mm Thread for Nikon
Eyepiece Projection - Use your eyepiece in extension tube. Threaded to accept standard 1.25" eyepiece filters. 1 x T-Ring for Nikon. M42x0.75mm outer thread on one end and standard 1.25" (31.7mm) fitting on the other.