8-Piece Aluminum Alloy Lens Adapter Rings for Telescopes and Astronomical Telescopes, 3/5/7/10/12/15/20/30mm Extension Tubes

Made of high-quality aluminum alloy for high wear resistance and damage resistance. Easy to install, this is a perfect replacement for old or damaged ones, ensuring reliable use. Crafted using precise CNC technology, it is highly precise and durable. Available in various sizes: 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, and 30mm, suitable for a variety of models. The interface has an M42x0.75mm female thread and an M42x0.75mm male thread.