... quality; 3)good Service and competitive price. Hand-hold and Air-leg Rock DrillInstruction The machine is mainly used in ... projects as well. When it is matched with air- leg model FT100,it can perform both dry ... starting ,light in weight ,fast drilling speed,lower air comsumption,smaller vibration,easier operation,lower trouble rate,long ... speed ≥180 r/min ≥200 r/min Air consumption ≤37 L/s ≤43 L/s