USED UTG Pro P.O.I Dovetail Riflescope Rings 30 mm Low Profile Black. O.I Precision Optics Interface Rings Series made at UTG PRO. Never lose zero with our patented P.O.I locking plate featuring dual spring-loaded guide rods and optional threaded recoil stop-pin. P.O.I top and bottom rings are precision-machined from one piece with the dovetail base to ensure the tightest tolerance inner diameters and a centered mounting base. Specifications for UTG Pro P.O.I Dovetail Riflescope Rings 30 mm: Manufacturer: UTG Pro Finish: Matte Black Tube Diameter: 30 mm Ring Quantity: Pair Fabric/Material: 6061-T6 Aircraft Aluminum and Steel Construction Color: Black Package Contents: UTG Pro 30mm/2PCs High Profile P.O.I Dovetail Rings UTG Pro RDU013010: P.O.I Dovetail Riflescope Rings 30 mm Low Profile Black