Engraving Pen Product Type Engraving Pen Compatible Workpiece Material Ceramic Glass Leather Metal Plastic Wood Duty General Maximum Strokes per Minute 32 400 stroke/min Collet Size Not Applicable Number of Tips Included 1 Tip Types Included Needle Required Pressure 90 psi Air Consumption 1.7 cfm Air Inlet Size 1/4 in Air Inlet Type NPT Minimum Hose Size 1/4 in Speed Settings Variable Tool Length 5 3/4 in Tool Weight 0.3 lb Number of Hoses Included 1