This is a T2 threaded 1.25" visual back, with a T2 female thread on one side, and a standard 1.25" eyepiece holder on the other side.
It can be used in many setups to attach to a male T-2 thread on telescope side and offers a 1.25" eyepiece holder to the user.
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Focusing Eyepiece Holder 1.25"/T-2
