Chicago Pneumatic Heavy Duty Pistol Grip Air Hammer Kit • Includes: CP717 Air Hammer Plus a 4 Piece Chisel Set Packed in a Heavy Duty Carrying Case • Air Hammer Features a Positive Action Trigger for Precise Control, Chisel Shank Opening .498", Bore Diameter 3/4", Piston Stroke Length 2-11/16", CFM 7, Hose Size 3/8", and Blows Per Minute 1800