1 All metal, anodic oxidation, aluminum manufacturing process, can used for a long time. 2 Using this extension tube, can obtain correct image scale. 3 Inner wall with extinction treatment to avoid radiating light affecting image. 4 Fine workmanship, practical astronomical telescope accessory. 5 Professional manufacturing, stable characteristics and high reliability.Condition: 100% Brand NewItem Type: M48x0.75 Extension TubeMaterial: AlloyColor: BlackInterface: M48x0.75Quantity: 1PCSWeight: Approx. 76gLength: Approx. 5mm/0.20inch, 10mm/0.39inch, 15mm/0.59inch, 30mm/1.18inch

What's in the box
1 x
M48x0.75 Extension Tube