Hi-Lux Rifle Scope sunshades are constructed from lightweight aluminum and reduces unwanted glare and sun reflections off the objective lens. The Hi-Lux Riflescope Sunshade comes in 3 diameters: 44mm, 50mm, 56mm. These sunshades are only compatible with Hi-Lux scopes. These Hi-Lux sunshades can be threaded into each other to create custom lengths. The 44mm and 50mm sunshades measure 3" in length. The 56mm sunshade measures 4" in length.