Specification Chisel Shank Opening : 0.401 inch (10.2 mm) Bore Diameter : 1/2 inch (12.7 mm) Stroke Length : 2-7/8 inch (73 mm) Blows Per Minute : 2160 B.P.M Operating Air Pressure : 90 PSI (6.2 bar) Avg. Air Cons. : 7.78 cfm (220 l/min) Net Weight : 2.9 lbs (1.2 kgs) Min. Hose Size : 3/8 inch (10 mm) Rivet Size : 5/32 Steel Rivet Size : 3/16 Alum