Powermate Air Hammer, Includes 4 Chisels and Spring: * Includes air hammer, retainer spring, 4 chisels, 1/4" NPT male plug and instructions * Average cfm requirements: 4.5 cfm at 90 psi * Blows per minute: 4500 * Stroke length: 1.6" * Operating pressure: 90 psi * Air inlet: 1/4" NPT air inlet with screened filter * Weight: 2.9 lbs * Vibration reduction grip adds comfort and control * Speed control knob easily adjusts hammer power * For use with Powermate QCS system * Model# 024-0272pm