The XIT Extension Tube for Nikon F-mount lens is a high-quality unit designed to fit cameras with Nikon F lens fittings. This twist-on extension tube, measuring 2.75 inches in length, is compatible with lenses featuring front diameters of 12mm, 20mm, and 36mm. Made by XIT and originating from China, this extension tube is a reliable option for photographers looking to capture images with longer focal lengths while maintaining optimal quality.