High quality brass tube scope, ¾” in diameter, 4X – 15mm objective lens, 3” eye relief. Fully coated optics for a sharp view. Brass screw caps on each end protects lenses. Includes unpolished, flat-bottomed brass mounts ( for octagon barrel), allows elevation adjustment at the rear with windage adjustment on front mount. Round barrels require the bottoms of the mounts to be made concave, or flat spots made on the barrel. Each mount requires (2) blind 6X48 standard American holes to be drilled and tapped into the barrel. Screws included.