General description This 'next generation' twin-pack combines two fantastic DeWalt power tools with new, more compact battery technology. The DCD999 is a powerful brushless Combi Hammer Drill Driver, while the DCF850 is a small and powerful impact driver ideal for automotive and industrial applications. The DCF850 provides 205 Nm of torque in a compact body of just 100 mm, offering enhanced control with a 3 mode switch, including Precision Drive to prevent damage during smaller jobs. An incorporated LED light improves visibility in difficult environments. Technical specifications Model: DCD999 (Combi Hammer Drill Driver) Model: DCF850 (Impact Driver) Torque (DCF850): 205 Nm Compact size (DCF850): 100 mm Battery type: POWERSTACK Battery power: 50% more power compared to DCB183 Battery size: 25% smaller than DCB183 Brushless motor (DCD999): Delivers 112 Nm and 1219 W (using 6Ah) 3 speed all metal gearbox (DCD999) 13 mm ratcheting keyless chuck (DCD999) Weight of POWERSTACK battery: 15%