A versatile adapter: Born for SV41 Mak, but also CanonW2054A, NikonW1077A bayonets, and cameras, and you can easily match a 1.25-inch international universal eyepiece, even other scopes with M48 Male Threads.
Make the SV41 Mak more fun: the special design of changing the size of the screw makes your scopes apply to different observation situations, both ground and astronomical observations.
High quality and well design: using the brass ring with high toughness enhances the wear resistance and stability of your scope, having a better combination with the coating by oxidizing the anode, your equipment will be protected well.