Combat Rifle Flip rear sights features a super low profile 0.388″ centerline when folded down flips ups to Mil-Spec height. The intermediate aperture is used for long-range precision and close-range rapid engagements. 0.5 MOA Rifle Windage Adjustment 0.65 MOA Carbine Windage Adjustment. Constructed of ordnance grade phosphate finished steel with a hardcoat 6061 aluminum base. Made in the USA. Torque clamp to 35in/pounds.