Engraving Pen, Product Type Engraving Pen Kit, Compatible Workpiece Material Ceramic, Glass, Leather, Metal, Plastic, Wood, Duty Industrial, Maximum Strokes per Minute 13,500 stroke/min, Collet Size 1/8 in, Number of Tips Included 3, Tip Types Included 1/4 in Chisel, Flat Chisel, Round Nose Chisel, Required Pressure 90 psi, Air Consumption 0.3 cfm, Air Inlet Size 1/4 in, Air Inlet Type NPT, Minimum Hose Size 1/4 in, Speed Settings Variable, Tool Length 5 in, Tool Weight 0.3 lb