Use this cantilever mount for mounting 1-inch telescopic sights onto flattop style AR-15 rifles. The offset of this cantilever mount positions the scope in a forward location, allowing the correct eye relief and head placement on an AR-15. Aluminum construction.Torque SpecsBase Clamp Screws 20 in/lbsRing Screws 18 in/lbsSpecificationsTube Size 1 inchWeight 6.7 ozCenter Scope Height 1.59 inches (40.39 mm)