DEWALT built high power, high efficiency motor delivers maximum performance in all drilling and fastening applications XRP extended run-time batteries provide long run-time and battery life Patented 3-speed all-metal transmission matches the speed to the application for optimal performance Heavy-Duty 1/2" axial locking chuck locks the sleeve to prevent bits from slipping and falling out Preferred ergonomics provides optimal balance, size, and weight Specifications Voltage: 18 V Max Power: 510 UWO No. Of Speed Settings: 3 Max RPM: 0-450/0-1,500/0-2,000 Clutch Settings: 22 Chuck Size: 1/2" Chuck Type: Metal, Single Sleeve Axial Locking Tool Weight: 6.0 lbs