ZAH392 Air Hammer (Round)-Shock Reduced SPECIFICATIONS Chisel Shank Opening : 0.401(10.2) inch(mm) Bore Diameter : 3/4(19) inch(mm) Stroke Length : 1-31/32(50) inch(mm) Blows Per Minute : 4000 B.P.M Avg. Air Cons. : 15.2(430) cfm(l/min) Net Weight : 3.4(1.5) lbs(kgs) Air Inlet Size : 1/4 PT/NPT Operating Air Pressure : 90(6.2) PSI(bar) Min. Hose Size : 3/8(10) inch(mm) Vibration : 2.5 m/s2