The Mark 4 AR 30mm Integrated Mounting System (IMS) features a forward cantilever design that pushes your scope out for improved eye relief and a full field of view. It positions the optic 1.4" above the rail (the same height as standard AR iron sights) which makes it faster and more natural to get behind the optic.Like every Leupold mount, it's built to be as rugged and dependable as the Leupold optics it holds. It's made in the USA and guaranteed to perform for life, this is the link between scope and rifle you can trust in all conditions.Material: AluminumBase Cant: NoRing Height Style: Super HighRing Diameter: 30 mmRing Height (in): 1.4Weight (oz): 6.05Keeper Clamp Torque: 65 in-lbsRing Top Screw Torque: 28 in-lbsLength (in): 5.43Rear Offset (in): .68Ring Depth (in): .65Length Within Rings (in): 3.46Keeper Length (in): 1Front Offset (in): 1.75Ring Width (in): 1.77Ring Height (in): 1.4