These low profile P.O.I..® (Precision Optics Interface) Rings have a 23mm center height to fit optics with a 1" tube and up to a 45mm outer objective. Leaper’s innovative P.O.I..® rings address three of the most critical scope ring requirements. First, they are progressively machined for a precise inner diameter scope interface to achieve a seamless ring-to-scope interaction. Secondly, the low profile, flush-fitting locking side plate controlled by dual spring-loaded guide rods interfaces with the rail with Torx screw locking to ensure secure and repeatable zero hold. Finally, the square-shaped integral recoil stop interfaces with a Picatinny slot via complete surface contact to eliminate the possibility of forward and aft movement from recoil vibrations. Each ring in the two-piece set is equipped with 4 Top Torx Screws and designed with a 22mm ring width. The rings are designed to fit on Mil-spec 1913 Picatinny Rail platforms. They are machined from 6061-T6 aluminum alloy and 4605 steel with a matte black hard coat anodize finish. Note: vendor recommends tightening the ring top screws with a torque value of about 25 inch-lb. and the side plate screw with torque value of about 45 inch-lb. Sold as a set of two rings only. Made in the USA by Leapers®, Inc.