Steiner Optics T-Series Tactical Rifle Scope - Waterproof, Fogproof, Shockproof Gun Scope for Hunting or Competition One-piece 30mm tube increases strength and reliability and provides greater elevation and windage adjustments for longer ranges Tapered, all metal magnification ring is angled so the shooter can see his magnification setting while positioned directly behind the scope Large, easy-to-grip windage/elevation/Parallax/Illumination knobs for positive, non-slip adjustment of the diopter, reticle and Parallax settings Locking diopter that prevents accidental rotation of the diopter Consistent Eye relief and a generous Eye box throughout the magnification range eliminates the need to reposition your Eye when changing magnification