Specification: Material: aluminum alloy Size:M48*0.75mm Includes: 1*M48*0.75 Lens Cap Features: 1,Precision 1:1 Fit – Designed with exact mold openings to ensure a perfect, secure fit for your astronomical telescope lenses. 2,Secure Protection – Crafted from durable aluminum to flawlessly shield your lens from dust, scratches, and damage. 3,Threaded for Stability – Easily screws onto lens threads for added security, preventing accidental slips or falls. 4,Universal Compatibility – Works seamlessly with both astronomical primary mirrors and photographic sockets for versatile use. 5,Lightweight & Strong – Made from premium aluminum alloy, offering robust protection without adding unnecessary weight. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store