Metal body, fully multi-coated lens provides a clear view. It can double as any 1.25-inch telescope eyepiece. Ideal for high-power observation. The brass compression ring can protect the eyepiece from damage or scratches on the tube. Keep the eyepiece looking . The back of the tube also has an external T-thread for connecting DSLR cameras and other T-thread accessories. Features: 1. Multi-coated 2. The edge of the lens is blackened to reduce internal reflections 3. The 1.25-inch barrel can be installed in standard 1.25-inch focusers and diagonals 4. The set screw hits the brass ring inside to fix the 1.25-inch eyepiece inside, eliminating the mark on the eyepiece barrel Model:SV137 Magnification:2x Interface:1.25Inch/M42*0.75 Coating:Full multi-coating Eyepiece protection:Internal brass ring Colour:Silver & Black Material:Metal Package Contents: 1 * Barlow Lens 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.