Technical Parameters 1. Length (Less bit):1030mm 2. Weight (Less bit):39.00kg 3. External Diameter:99mm 4. Bit Shank:Cop44/DHD340A 5. Hole Range:�?110-�?135 6. Connection Thread:API 2 3/8â?³ Reg 7. Working Pressure:1.0-2.5Mpa 8. Impact Rate at 1.5Mpa:28HZ 9. Recommanded Rotation Speed:25-40r/min 10. Air Consumption: 145-350PSI / 200-600CFM