Built to tight tolerances to take the punishment dished out by slug guns and maintain its reliability and accuracy. The highly precise, smooth magnification system ensures reliability and predictability shot after shot. The unique EXT reticle includes distance markers for added accuracy over a variety of distances. Multicoated lenses guarantee high light transmission. Plus, crisp edge-to-edge clarity ensures you’ll see your target clearly across the full spectrum of legal shooting light. The 4"-4.5" eye relief allows you to maintain a wide field of view. All are nitrogen purged for protection against fogging. In addition, they’re fully shockproof and waterproof. Windage and elevation adjustments are smooth, precise and clear. Hard-coat durable anodizing protects the scope and will not fade. 1" tubes.