Gosky T Thread to 1.25&ldquo; Adapter (M42x0.75-1.25inch) - with Dual Clampscrews and Compression Ring The 1.25"/T-2 Focusing Eyepiece adapter comes with three locking screw and compression ring T2 (M42x0.75.) threads on both ends: One side: Male and the other side Female. Provides fine focusing abilities for lunar and planetary imaging Comes with a brass compression insh to prevent the marring of your telescope accessories. Machined of high quality aluminum and anodized black.