Trijicon SRS Tenebraex eyepiece & objective flip cap set w/ retainer AC31006 is inclusive of an eyepiece flip cap, objective flip cap and a retainer. It is endowed with an instant access flip-up design and offers best protection to your optic. The lightweight and durable caps for the ocular and objective ends easily rotate around the retainer into the desired position. They open up and lock into place, and prove to be extremely useful for rifle scope users. The black Tenebraex accessory set is built to fit Trijicon SRS, sealed reflex sights.