These units feature a teasing throttle with progressive hitting frequency for better control, as well as a high-quality Boyer valve for consistent blows. They’re built for long life in rugged conditions with a forged steel handle and a hardened steel piston. They also feature a stepped cylinder design to prevent accidental ejection of the piston from the cylinder. Models are available with a pistol grip handle with an outside trigger or a D-handle with an inside trigger, as well as an 8" or 11" cylinder.