Feature: 1. Applicability: Can be used with any astronomical telescope equipped with a 0.965in mount for wide field lunar observations; medium sized star clusters; and a wide range of cloudy nebulae and deep space targets. 2. Coated Optical Lens: Provides high quality observation without additional chromatic aberration, making the image clearer and sharper. 3. 2X Magnification: Adds 2X magnification to any 0.965in eyepiece, allowing you to see the lunar surface and other planets more closely and in greater detail. 4. With Set Screw: The extender has set screw on the side, with just one turn of the screw, the accessory can be firmly held in place. 5. Aluminum Alloy Body: The aluminum alloy body with black anodized surface is accurate machined, stable and durable, and can be used for a long time. Specification: Item Type: Barlow Lens Material: Aluminum Alloy, Optical Glass Multiple: 2X Lens Material: Metal Aluminum Lens Material: Optical Glass Lens Lens Coating: FMC Green Film Interface Size: 0.965in (Approx. 24.5mm) Product Size: Approx.24.5 x 52mm / 1 x 2in. Package List: 1 x Barlow Lens