Hi quality adapter.
Useful for connecting to the ZWO filter drawer to reduce the scope side back down to 42mm
(in place of the thin ring adapter that comes with the drawer but does add 3.5mm optical path, with my William Optics adjustable reducer the extra optical path is not an issue)

This Baader adapter is a quality product that I would recommend to anyone who is looking for a T female to M48 male adapter.

nicely built and very strong.
Does what it says on the tin