Weaver delivers high quality with these Detachable Extension Top Mount Rings for your firearm. They help to reduce strain on your eyes when using your weapon for extended periods of time. In addition, these rings are very easy to assemble and detach from your weapon when needed. They will extend your scope position into a more preferred position. The extensions provide for up to 0.75 inches further back or forth. The rings are carefully crafted to be highly durable and able to hold up under long hours on the range.