... and Air-leg Rock Drill 1)advanced equipment; 2)excellent quality; 3)good Service and competitive price. Hand-hold and Air-leg Rock DrillInstructionThe machine is ... in starting ,light in weight ,fast drilling speed,lower air comsumption,smaller vibration,easier operation,lower trouble rate,long-life ... speed ≥180 r/min ≥200 r/min Air consumption ≤37 L/s ≤43 L/s Y018 Hand-hold and Air-leg Rock Drill