Item Type: 1.25 Inch 10mm Telescope Eyepiece_x000D_ Lens Material: Optical Glass Lens_x000D_ Focal Length: Approx. 10mm / 0.4in_x000D_ Interface Size: Approx. 1.25 Inches (31.7mm)_x000D_ Thread Specification: M28.6x0.6mm_x000D_ Color: As Pictures Shown_x000D_ Weight: Approx. 45g / 1.6oz 1Good Performance: Fully coated lens, high quality optical glass lens, provides maximum brightness. Thread specification is M28.6x0.6mm 2Scope of Application: Support all kinds of telescopes, mirrors, refractors, observe star clusters, moon, sky, planets and other celestial bodies. 3Wide Angle Lens: The 10mm focal length telescope eyepiece has a wide field of view and superior performance. 4Special Treatment: The inner barrel is black treated to reduce glare and improve light transmission and contrast. 51.25 Inch Interface: 1.25 inch 10mm telescope eyepiece can be used with standard 1.25 inch mount telescopes or filters.1 x Eyepiece