UTG PRO 34mm/2PCs Medium Profile P.O.I Picatinny Rings Black. O.I (Precision Optics Interface) Picatinny Scope Rings. Aluminum and Steel Construction Integral Squared Recoil Stop Low Profile Torx Locking Side Plate with Dual Spring Loaded Guide Rods Precision Machined Inner Ring Surface 4 Torx Screws 34mm Diameter 32mm Center Height 22mm Wide Specifications for UTG PRO 34mm/2PCs P.O.I Picatinny Rings: Manufacturer: UTG Pro Tube Diameter: 34 mm Ring Quantity: Pair Fabric/Material: 6061-T6 Aluminum Alloy / 4605 Steel Condition: New Color: Black Mount Type: Picatinny Attachment Type: Picatinny Package Contents: UTG PRO 34mm/2PCs P.O.I Picatinny Rings UTG PRO RWU013415: 34mm/2PCs Medium Profile P.O.I Picatinny Rings Black