Air Engraving Pen Product Type Air-Powered Engraving Pen Compatible Workpiece Material Metal Duty Medimum Maximum Strokes per Minute 11 400 stroke/min Collet Size Not Applicable Number of Tips Included 1 Tip Types Included Standard Required Pressure 90 psi Air Consumption 1 cfm Air Inlet Size 1/4 in Air Inlet Type NPT Minimum Hose Size 1/8 in Speed Settings Variable Tool Length 5 1/2 in Tool Weight 0.4 lb Throttle Type Slide Sound Level 88.5 dBA Average Flow Rate 1 cfm