Tenebraex Vortex Razor HD Gen II 3-18x50, 4-16x50, 6-24x50 Flip Cover 50MMFC-FCV is extremely useful for rifle scope users as it safeguards the optic. Equipped with an instant access flip-up design, the lens cover for the objective end easily flips up and out of the way at the time of action. It can be conveniently flipped back when not in use. The Tenebraex 50MMFC-FCV is lightweight and durable. It is built in compatibility with Vortex Razor HD Gen II 3-18x50, 4-16x50, and 6-24x50 scopes.