UTG PRO 1 in Low Profile P.O.I Picatinny Rifle Scope Rings Black 2 Pieces. 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 1 Diameter 33mm Center Height 22mm Wide Specifications for UTG PRO 1in/2PCs P.O.I Picatinny Rings: Manufacturer: UTG Pro Finish: Matte Black Hard Coat Anodize Tube Diameter: 1 in 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 1in/2PCs P.O.I Picatinny Rings UTG PRO RWU012510: 1 in Low Profile P.O.I Picatinny Rifle Scope Rings Black 2 Pieces