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 LensMaterial: Aluminum Alloy, Optical GlassMultiple: 2XLens Material: Metal AluminumLens Material: Optical Glass LensLens Coating: FMC Green FilmInterface Size: 0.965in (Approx. 24.5mm)Product Size: Approx.24.5 x 52mm / 1 x 2in.Package List:1 x Barlow Lens