The clamping rings of the Svbony SV158 2" (75 mm) extension extension attachment give even pressure and precise positioning to 2" tubes for eyepieces, barlow lenses, etc.
Often, when trying to shoot in prime focus, the focus slider is too short, meaning you can't get it sharp. The same can happen if you want to use your binoculars without a focus mirror. In this case, an extension arm is the solution, allowing focusing in such cases.
If you want to use your astronomical binoculars for nature observation, the closest point you can reach with them is often too far away. In this case, too, an extension tube is the solution. The further the eyepiece or camera is from the optics, the closer you can get the object in focus.
The Svbony SV158 2" (75 mm) extension tube has an M48 (2") filter thread at the end.