The One Hundred Concepts ShockCollar is a locking ring that keeps shock cords secure around your rifle scope. It offers a sleek, hassle-free alternative to ranger bands and is designed to work with the One Hundred Concepts ScopeCap to protect the lens and reduce reflections. The ShockCollar makes it easy to remove the light head for quick battery changes or to operate rotating heads on certain weapon light models. This version is compatible with size 2 ScopeCaps.