MAX High Pressure Nailing Machine HN-50N4(D) N50, CN50, 27 to 65 for Steel Plates, 27 to 65 for Concrete. The pressure switching lever allows you to easily change the air pressure inside the nailer. The continuous hit is low recoil to prevent fatigue and speedy performance. Size: 11.4 x 5.0 x 12.0 inches (289 x 126 x 304 mm) Accessories: Protective glasses, oil strainer, carrying case.