250mm Air hammer(8pcs 250mm Air Hammer Set) Piston Stroke: 3-5/8 Blow Per Minute:2000bpm Average Air consumption:4cfm Inlet Size: 1/4" Overall Length: 8.9"/225mm Weight: 3.88 lb/1.76kgs Min. Hose Size: 3/8" Working Pressure: 90psi Kit include: 1pc Air Hammer, 5pcs Air Chisel Set ,1pc Air Quick Fitting, 1pc Spring