Air Engraving Pen, Product Type Air-Powered Engraving Pen, Compatible Workpiece Material Metal, Duty Medium, 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, Tool Series 140EP, Sound Level 88.5 dBA