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The NcSTAR 30mm (1.18") Adjustable Height Ring with 1" Insert features unique split ring design with Elevation Screw, Turn the elevation screw to raise or lower the Ring Height. It mounts onto Weaver/ Picatinny/ MIL-STD 1913 type rails. It is perfect for use with magnifiers, it will allow the shooter to center align the Magnifier with the Reflex Optic.