The Anti-Reflection Device (ARD) minimizes reflections created by the objective lens, preventing a marksman from being detected by lens glare. Additionally it prevents stray light from entering the objective causing unwanted reflections in bright light conditions. This black ARD is equipped with threads on both sides allowing you to attach Schmidt Bender filters or protective lens covers. FeaturesEliminates lens glare Increases the stealth of the marksman Reduces stray light from entering the objective Threaded on both ends to accept filters and protective covers Fits all Schmidt Bender 50mm objectives Schmidt Bender killFlash 50mm Objective Double Sided Thread ARD 971-60501