This Scope Protector is an excellent solution to a common problem. If the lens of a rifle scope or red dot is hit by a BB on the front, it will usually become damaged, crack the glass or lead to a hole. The visor is useless and then the fragments can cause injury. With the Scope Protector, this problem is a thing of the past. The protector fits any Weaver and Picatinny rails and mounts directly in front of the sight. A 3mm thick plexiglass now provides reliable protection. If necessary, the protector can also be folded down or the white lenses can be exchanged for yellow lenses. The yellow glass is also included in the delivery and provides better contrast. The protective film must be removed before first use.