UTG Pro 30mm/2PCs Low Profile P.O.I Dovetail Rings Black. O.I Dovetail Scope Rings Aluminum and Steel Construction Features a Low Profile Torx Screw Locking Side Plate with Dual Spring Loaded Guide Rods Threaded Recoil Stop Pin and a Precision Machined Inner Ring Surface 30mm Diameter 37mm Center Height 22mm Width 4 Top Torx Screws 2 PCs Per Set Specifications for UTG Pro 30mm/2PCs High Profile P.O.I Dovetail Rings: Manufacturer: UTG Pro Finish: Matte Black Tube Diameter: 30 mm Ring Quantity: Pair Fabric/Material: 6061-T6 Aircraft Aluminum and Steel Construction Condition: New Color: Black Package Contents: UTG Pro 30mm/2PCs High Profile P.O.I Dovetail Rings UTG Pro RDU013010: UTG PRO 30mm/2PCs Low Profile P.O.I Dovetail Rings Black