Features: Adjustable speed, high precision, high efficiency, long service life. Double hammer strike structure, strong moment of force, easy to use. Straight handle design, compact appearance, comfortable handle, easy to operate. Reversible rotation, high speed, low noise, good mechanical performance. Suitable for the fastening and dis-assembly of screws in the light industry field such as machine manufacturing and metal auto repair. Specification: Model: KP-8141 Material: Aluminum alloy and Iron and Steel Weight: 804g or 28.4oz Color: as pictures shown Bolt Capacity: 4-6mm Maximum moment of force: 35N.m Chuck Size: 1 or 4" No load speed: 9000rpm Air Inlet Size: 1 or 4" Working Pressure: 0.62mpa Air Screwdriver: 21.5cm or inch Package List: 1 x Air Screwdriver 1 x Screwdriver Bit 1 x Hook Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.