This is a very rare ultra low profile 2" to 1.25" eyepiece adaptor. It has about one inch of depth to allow more inward focus travel.
Imagine you have a Newtonian reflector sometimes you may have trouble doing focusing due to lack of inward focus travel especially when balow lens is used. This adaptor comes in rescue.
This kind of adaptor is usually sold for $30.....I got it for a discount but then I realize I don't need it, so.....
I am selling it for $15 SHIPPED (in US and Canada)
Thanks for looking