Find your optimal eye relief by equipping your scope with the Weaver® Detachable Top-Mount Ring Set, which is designed to let you position your scope up to 0.75" forward or backward. Loosening the thumb nuts allows you to switch to iron sights with ease, and the wide top straps hold firm at zero under jarring recoil. 1" tube diameter. 1" high height. Weaver Detachable Top-Mount Ring Set Black - Scope Rngs And Rifle Accessories at Academy Sports