Tenebraex Tactical Tough Eyepiece flip cover for Nightforce 4-16 ATACR F1, Steiner M5Xi offers best protection for Nightforce and Steiner optics. Equipped with an instant access flip-up design, the lens cover for the ocular end easily flips up and out of the way when the scope is subjected to use. It can be conveniently flipped back when not in action. It is lightweight, durable and extremely useful for rifle scope users. The black Tenebraex UAC015-FCR is built to fit Nightforce 4-16 ATACR F1 and Steiner M5Xi rifle scopes, and satiate tactical purposes.