... quarries and construction for breaking works. Product Name:G7 Pneumatic air hammer1. Good quality with strict quality system control2. Reasonable price ... . Good quality with ISO9001, MA, CE certification4. Use compressed air as power5. Safe for coal/gold mining and tunnel, quarry ... (Mpa)Impact energy≥30 (J)Impact frequency≥21.6 (Hz)Air consumption1m3/minAir pipe inner dia.φ19 (mm) Pnuematic air hammer