UTG 1/2PCs Med. Profile Steel Picatinny Rings, 16mm Wide Features Upper and Lower Ring Portions Precision Machined from One Solid Block of Steel to Strict Tolerances for Optimal Fit Heat Treated QPQ Nitride Matte Black Finish for Strength and Added Weather and Wear Resistance Progressively Machined for a Precise Inner Ring Diameter to Achieve Optimal Tube Alignment; Grooved Inner Surface Guarantees Tube Retention Radiused Edges and Corners to Prevent Snagging, Scratching, or Tearing of Other Gear and for Effortless Access to Scope Windage and Elevation Turrets Utilizes Locking Torx Screws and Square-shaped Integral Recoil Stop for a Secure Zero Hold 27.7mm Center Height and Fits 1 Tube Optics with up to a 55 mm Outer Objective Diameter Includes 2 Piece Ring Set Each Equipped with 4 Top Torx Screws Mounting Base Designed to Fit on MIL-STD-1913 Rail Platform T15 Torx Wrench for Simple and User Friendly Installation Specifications Material tSteel Pieces 2 Rail Type Picatinny Profile Level Medium Ring Diameter 1 Ring Width 16 mm Max. Scope Outer Dia. 55 mm Screws Per Ring 4 SOLD QUANTITY 1