Rock-solid cantilever scope mount, ideal for mounting most 1" diameter tube scopes on AR-15 flat-top rifles and carbines. Has a Picatinny rail platform on the top of the ring to mount additional accessories like red dots, flashlights, and lasers. It's 5 inches long and weighs just 8.3 ounces. Made of Anodized Aluminum with 3 steel screws on each side of each ring.