The Primary Arms SLx Micro Prism Anti-Reflection device eliminates excess scope glare and hides any glint that could give away your position. The SLx Micro Prism Anti-Reflection Device is extremely helpful in keeping your glass clean from dirt and debris that can scratch the lens. This anti-reflection device is made from anodized aluminum and is easily installed by screwing it into the objective lens. – Only fits Primary Arms SLx 1X Micro Prism Scope models – Eliminates scope glare and glint – Protects scope lens from dirt and debris – Made from durable anodized aluminum