Air Engraving Pen Product Type Engraving Pen Compatible Workpiece Material Ceramic Glass Leather Metal Plastic Wood Duty Not Applicable Maximum Strokes per Minute 11 400 stroke/min Collet Size Not Applicable Number of Tips Included 1 Tip Types Included Engraver Needle Required Pressure 90 psi Air Consumption 12.7 cfm Air Inlet Size 1/8 in Air Inlet Type BSP Minimum Hose Size 1/8 in Speed Settings Variable Tool Length 6 7/8 in Tool Weight 0.3 lb Hose Length 6.5 ft