Designed to fit Mil-Std. 1913 scopebases, Nightforce rings are preciselymanufactured to match themachined recess of a NightforceMil-Std. 1913 base, providing perfectalignment and accuracy. Nightforcerings are designed and producedin-house to exacting specificationsentirely out of steel orfrom 7075-T6 aluminum withbeta series titanium crossboltsand jaws. All Nightforcerings are 100% micro-radiused andhoned in pairs for perfect fit of 30mmscope tubes to prevent the possibility ofthe rings damaging your scope.
Sinclair, Issue:5B, Page:209
Ring heights are measured from the top of the base to the center of the ring.