1、Suitable for 25 inch / 37mm astronomical telescope eyepiece 2、Fully multi-coated glass lens has high light transmission​ and can offer excellent image contrast and clearity 3、High-definition 2X magnification, helps you see clearer and farther 4、Constructed with aluminium alloy, sturdy, lightweight and durable 5、Nice accessory for astronomy lovers Features: Suitable for 1.25 inch / 31.7mm astronomical telescope eyepiece. Fully multi-coated glass lens has high light transmission and can offer excellent image contrast and clearity. High-definition 2X magnification, helps you see clearer and farther. Constructed with aluminium alloy, sturdy, lightweight and durable. Nice accessory for astronomy lovers. Specification: Material: Aluminium Alloy Magnification Factor: 2X Barrel Size: 1.25inch / 31.75mm Thread: M 28.6 * 0.6 Size(Diameter*Height): approx. 30 * 22mm / 1.18 * 0.87inch Weight: approx. 18g Package List: 1 x Barlow Lens 1 x Storage Case