Feature: 1. 2X Magnification: Barlow lens increases the magnification of any 1.25 inch telescope eyepiece by a factor of 3X, effectively giving you a closer look at the Moon and other planets. 2. Multicoated: Barlow lens adopted HD optical glass, achromatic adhesive lenses, multi layer broadband anti reflection green film to maximize the image contrast for clear observation. 3. Perfect Protection: Metal barlow lens interface built in copper ring for goggles protection, equipped with an eyepiece protection cover to ensure that the lens is not affected by dust. 4. Widely Use: Barlow lens is equipped with a fixing screw to securely fix the eyepiece. Compatible with most telescope eyepieces, eyepiece filters, and other accessories with 1.25in threads. 5. Sturdy Construction: Multi coated barlow lens made of aluminum alloy and anodized body, adopted CNC machining, firm and sturdy, which can be used for a long time without broken. Specification: Item Type: 2X Barlow Lens Material: Aluminum Alloy, Optical Glass Size: Approx. 3.18cm / 1.25in Package List: 1 x Barlow Lens 2 x Dust Covers (Pre Installed)