Ultimate Arms Gear 4x32 Dual Red Green Illuminated Crossbow Rangefinder Reticle Hunting Target Tactical Scope With 7/8" Rail Low Profile Ring Mounts + Lens Covers & Lens Cleaning Kit Magnification- 4X Fixed Crystal Clear 32mm Lens . Tube Diameter- 1" Crossbow Rangefinder Reticle allows the shooter to estimate range of target Full Windage and Elevation Adjustments Nitrogen Filled, Shockproof, Fogproof, and Water Resistant