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Feature:1. All metal, anodic oxidation alumina manufacturing process, can used for a long time. 2. Using this extension tube, can obtain correct image scale. 3. Inner wall has extinction treatment, avoid radiating light affect imaging. 4. Fine workmanship, sturdy, durable and long service life. 5. Four lengths for you to choose, to meet different needs and requirements. Spec: Condition: 100% Brand NewItem Type: Extension TubeMaterial: AlloyColor: BlackInterface: M48x0.75Quantity: 1PCSOptional Length: Approx. 5mm/0.20inch, 10mm/0.39inch, 15mm/0.59inch, 30mm/1.18inch Package List:1 xExtension Tube