Engraving Pen Kit Product Type Engraving Pen Kit Compatible Workpiece Material Metal Plastic Duty Industrial Maximum Strokes per Minute 18 750 stroke/min Collet Size Not Applicable Number of Tips Included 3 Tip Types Included Coarse Point Stylus Fine Point Stylus Medium Point Stylus Required Pressure 90 psi Air Consumption 1.5 cfm Air Inlet Size 1/8 in Air Inlet Type NPT Minimum Hose Size 1/4 in Speed Settings Variable Tool Length 5 5/8 in Tool Weight 0.3 lb