Features: This M54 internal thread dustproof metal female cap with lanyard is crafted from high strength metal for great corrosions resistance. Featuring precise internal threads for safely fit on M54 interfaces, it effectively blocks dust, dirt, and moisture ingress. Ideal for photographers and professional users seeking dependable accessories for binocular, monoculars, or other opticals gear. Perfect for camping, hiking, wildlife observation, and any field activities where dustproof caps are essential to shield devices from harsh accents. Enables convenient hanging on cameras or equipment to prevent loss, and its light weight construction make easy portability during adventures. Specifications: Materials: ABS Color Optional: 2 Color are Available as Shown in the Picture. Package Weight: approx.26g Diameter: approx.5cm/2in Package Includes: 1Pc Thread Dust Cap note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!