Features: Double hammer strike structure, strong moment of force, easy to use. Adjustable speed, high precision, high efficiency, long service life. Straight handle design, compact appearance, comfortable handle, easy to operate. Reversible rotation, high speed, low noise, good mechanical performance. It is used for tightening and loosening screws and nuts, etc. Suitable for furniture assembly, furniture maintenance, electromechanical assembly, doors and Windows production, etc. Specifications: Model: KP-8041 Material: Aluminum alloy & Iron & Steel Bolt Capacity: 4-5mm Maximum moment of force: 35N.m Chuck Size: 1/4" No load speed: 9000rpm Air Inlet Size: 1/4" Working Pressure: 0.62mpa Air Screwdriver Length: 21.5cm/8.5inch It's Size:21.5*4.2*4.2cm/8.46*1.65*1.65in Package Weight: 808g/28.5oz Package Size:22.3*6.8*5cm/8.78*2.68*1.97in Package List: 1 * Air Screwdriver 1 * Screwdriver Bit 1 * Hook