8PCS Photography Extension Tubes Sturdy Reliable For Telescopes Easy To Use

Feature: \n 1. Easy to install, perfect replacement for the old or damaged one, reliable to use.\n2. Made from high quality aluminum alloy, which is wear\u2011resistant and not easy to damage.\n3. Using fine workmanship CNC technology, the accuracy is higher, durable.\n4. The female thread specification of the interface is M42x0.75mm, the male threadspecification is M42x0.75mm.\n5. Various sizes of 3mm/5mm/7mm/10mm/12mm/15mm/20mm/30mm are suitable for different models. \n\nSpecification: \n\nItem Type: Lens Extension Tubes\nMaterial: Aluminum Alloy\nColor: Black\nProduct Size: Approx.3mm / 0.12in, 5mm / 0.20in, 7mm / 0.28in, 10mm / 0.39in, 15mm / 0.59in, 20mm / 0.79in, 30mm / 1.18in, 12mm / 0.47in\nApplication: Extend the length of the primary mirror of the astronomical telescope\nExtinction Treatment: Internal with extinction thread\nInterface Female Thread Specification: M42x0.75mm\nInterface Male Thread Specification: M42x0.75mm\n\nPackage List: \n1 x 3mm Extension Tube\n1 x 5mm :