Engraving Pen Product Type Engraving Pen Duty General Maximum Strokes per Minute 3 400 stroke/min Required Pressure 90 psi Air Consumption 1 cfm Air Inlet Size 1/4 in Air Inlet Type NPT Minimum Hose Size 3/8 in Tool Length 6 3/4 in Hose Length 59 in Air Inlet Gender Male Average Flow Rate 1 cfm Features Cushion Finger Grip for Comfort Fine-Point Stylus for Engraving