Tactical Side Wheel Focus 8-32x44 Mil-Dot Scope Rifle + Free 20mm Rail Mounts New True One-Piece 30mm Tube with Black Textured Finish Side wheel parallax adjustment Fast-Focus Eyepiece Fully multicoated lenses for unsurpassed light transmission/contrast 1/4 M.O.A. Fingertip-Resettable Windage and Elevation Adjustment Waterproof , fogproof and shockproof