Made with ultra-skeletonized 6061 aluminum set to precision match with 1913 Picatinny rails, Rebel mounts are lightweight, durable, and versatile. Rebel Riser features an adaptable RMR footprint plate that you can set to either 1.6" lower 1/3 co-witness height, or 1.4" absolute co-witness configuration.  1913 Picatinny Base Direct fit for Liberty / Justice / Kingslayer dot sights Durable 6061 Aluminum Construction Matte Black Anodized Finish Super light at 1.78 ounces CNC Machined T15 Star bolts: 10 inch-pounds torque Optic footprint screw thread pitch: M3.5 x 0.6 Centerline Height Options: 1.60”, 1.40”