Detailed Product Description 1/ 2" Twin hammer mechanism Heavy Duty Pneumatic Impact Wrench 1. Handle exhaust 2. Super power for car tire maintenance & assem 1/ 2" Heavy Duty airtools ( Twin Hammer) 1. Square drive 1/ 2" 2. No-load speed 7500rpm 3. Capacity bolt dia. M16( mm) 4. Max torque 550n. M 5. Vibration of square head