Lens material: metal-aluminum. Size: 1.25 inches (about 31.7 mm). Key benefits - Durable construction: Aluminum body provides strong, lightweight protection for optical elements and mechanical connections. - Standard fit: 1.25-inch (31.7 mm) diameter matches common optical sockets and adapters for reliable compatibility. - Stable performance: Precision-machined sizing reduces play and wobble, keeping optics aligned for consistent results. - Corrosion-resistant and easy to handle: Metal finish withstands field use and repeated installation without deforming. Why you need it - Ensures a secure, repeatable connection between optical components that use the 1.25-inch standard. - Protects delicate lenses and mounts from impact and wear while maintaining accurate alignment. - Keeps assemblies compact and lightweight without compromising strength. Key attributes - Function: Metal-bodied lens component or sleeve intended for use with 1.25-inch optical openings. - Compatibility: Designed for any device or accessory that accepts 1.25-inch (31.7 mm) lenses or adapters. - Size: 1.25 inches (about 31.7 mm) — the widely used standard for many telescopes, adapters, and optical accessories. - Material: Metal-aluminum provides a balance of stiffness, low weight, and resistance to corrosion. - Performance: Precision fit, reduced mechanical play, durable under normal field and workshop conditions. Typical use scenarios - Telescope accessories: Replace or mount eyepieces and filters that use the 1.25-inch standard to maintain solid, aligned viewing during observation sessions. - Field repairs and upgrades: Swap in this aluminum lens body or sleeve when refurbishing optical assemblies or converting adapters in the workshop. - Camera/microscope adapters: Use as a durable interface component where a 1.25-inch connection is required to join optics or accessories. Professional, reliable choice when you need a sturdy, standard-sized 1.25-inch (31.7 mm) metal-aluminum lens component that keeps optical parts aligned and protected.