Nothing is more frustrating than breaking a scope on the hunt with no way to remove it from the rifle. Weaver-style, 1" quick detach rings give you a rock solid mounting system for optics that can be removed from the base quickly and easily with QD levers. Instead of walking back to camp empty handed, you can simply remove the scope and use the iron sights. Immediate return to zero means that you won’t spend precious daylight sighting back in if you’ve taken the scope off for dense woods hunting. Two, Torx head screws fasten rings securely to scope. Available in Low, Medium, and High. Mfg: Burris Measurements are from the bottom of the scope tube to the bottom of the ring: Low .130", Med. .255", High .450".