USED UTG Pro P.O.I Picatinny Rifelscope Rings 30 mm High 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 square integral recoil stop. P.O.I top and bottom rings are precision-machined from one piece with the picatinny base to ensure the tightest tolerance inner diameters and a centered mounting base. Specifications for UTG Pro P.O.I Picatinny Rifelscope Rings 30 mm: Manufacturer: UTG Pro Tube Diameter: 30 mm Ring Quantity: Pair Fabric/Material: 6061-T6 Aluminum Alloy / 4605 Steel Color: Black Attachment Type: Picatinny Package Contents: UTG PRO 30mm/2PCs P.O.I Picatinny Rings UTG Pro RWU013022: P.O.I Picatinny Rifelscope Rings 30 mm High Profile Black