This simple black-anodized aluminum adapter is designed with a standard M42 T-mount on the camera side of a 1.25" barrel with M28.5x0.6 threads.
The ZWO T-Mount Adapter is compatible with any telescope that has a 1.25" focuser. Attach the adapter to a compatible astro camera or DSLR with T-Ring by threading it on until hand-tight. Then simply slide the 1.25" barrel into the focuser and lock it down. Now you are ready to do prime focus photography through your telescope!