SCT Thread To 1.25 Inch Telescope Adapter Telescope Conversion Ring Astronomical Telescope Accessories This is a metal adapter that screws onto the standard rear cell threads of Schmidt-Cassegrain and accepts 1.25inch accessories, including diagonals, eyepieces (for straight-through viewing), Barlows, webcams, and any other accessory with a 1.25inch insert barrel. This visual Back is composed of 90712-1.25inch T tube and 90735-T-Ring 90712-M42*0.75 female threads to 1.25 Inch Tube 90735-SCT female threads to M42*0.75 male threads T-ring Colour:black Material:Metal Size:Approx. 60 x 44mm Package Contents: 1 x Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.