Includes: High Performance Offset Dual Ring Scope Mount, 2 Thumb Screws. Materials: 6061 Aircraft Grade Aluminum Compatibility: AR-15, Rifles with Picatinny rails Weight: 9.00 oz Diameter: 1.00 in Length: 5.75 in Base Length: 3.00 in Color: Black Warranty: Lifetime The Monstrum Tactical Offset Dual Ring Picatinny Scope Mount is built to mount standard 1 inch tube scopes to any standard Picatinny rail equipped rifle. The offset design provides an additional 2 inches of forward extension, allowing extra flexibility for optimum eye relief and shooting position. The mount is 5.75 inches in total length. The base is 3 inches long with the mounting bolts spaced 2 inches apart, a minimum of 3 inches of rail space is required to install. The height between the top of the base to the bottom of the scope rings is 1 inch, providing 1 inch of vertical clearance. The mount is constructed of lightweight 6061 aluminum, the mount weighs a mere 9 ounces.