Positive action trigger for precise control. Ideal for front end work, king pin removal and installation of bulldozer walking beams, removal of truck springs and heavy duty spring bushings. 1800 blows per minute at 90 PSI. Specifications: 0.498" shank opening. 3/4" bore dia. 2.69" piston stroke. Weighs 4.75 lbs. 3.13 CFM average air consumption, 12.5 CFM actual consumption at load. 1/4" NPTF air inlet. 3/8" min. hose size. Produces 95 dB of noise