... casting, 420 watts power, strong endurance Speed control switch, positive and neg variable speed electric drill1. Aluminum shell casting, 420 ... watts power, strong endurance2. Speed control switch, positive and negative transfer function3. Ball bearing, ... design, operation comfortablelyThe input power: 420 w Chuck: 10 mm (key) No-load speed: 0-3000 RPM Switch: 2 refers ...