UTG PRO 30mm/2pcs. High Profile P.O.I Picatinny Rings Specifications: - High Profile P.O.I (Precision Optics Interface) Rings Have a 37mm Center Height to Fit Optics with a 30mm Tube and up to a 73mm Outer Objective - The Innovative P.O.I (Precision Optics Interface) Addresses 3 of the Most Critical Areas in Scope Rings - a) Progressively Machined for a Precise Inner Ring Surface to Achieve a Seamless Ring-to-Scope Interaction b) Low Profile and Flush-fitting Locking Side Plate Controlled by Dual Spring Loaded Guide Rods Interfacing with the Rail with and Torx Screw Locking to Ensure Secure and Repeatable Zero Hold c) Square-shaped Integral Recoil Stop Interfacing with a Picatinny Slot via Complete Surface Contact to Eliminate the Possibility of Forward and Aft Movement from Recoil Vibrations - 2 Piece Ring Set Each Equipped with 4 Top Torx Screws Designed with a 22mm Ring Width - Designed to Fit on Mil-spec 1913 Picatinny Rail Platforms - Machined from 6061-T6 Aluminum Alloy and 4605 Steel with Matte Black Hard Coat Anodize - UTG PRO Original Snag-free Contoured Profile with Reduced Weight and Size