This 'next generation' twin-pack combines two fantastic DeWalt power tools with new, more compact battery technologyThe DCD999 is a powerful brushless Combi Hammer Drill Driver. The DCF850 is a small and powerful impact driver ideal for automotive and industrial applications. It provides 205 Nm of torque in a compact body of just 100 mm. The DCF850 offers users enhanced control with a 3 mode switch, such as Precision Drive which ensures the material and fastener are not damaged during smaller jobs. The incorporated LED light improves visibility in difficult environments. This kit is supplied with two compact POWERSTACK batteries which provide 50% more power compared to the DCB183 battery, within a 25% smaller footprint than the DCB183a. Also included are a TSTAK compatible box and charger. POWERSTACK battery technology - the most powerful, compact and lightest weight battery Get ready for performance like you've never seen before. The 18V Dewalt Powerstack Compact Battery utilizes revolutionary stacked pouch battery cell technology Packed with power - delivers 50% more power and features stacked pouch battery cell technology Works in tight spaces - Maximize space in your toolbox and get into hard to reach areas with a battery engineered 25% smaller Won't weight you down - Work overhead with a powerful battery weighing in 15% lighter Low impedance construction increases power. Delivers more power (v DCB183) Superior thermal performance versus cylindrical cells, thus increasing recharge cycles Smaller than cylindrical cell batteries (no wasted space) DCD999NT Features The most powerful 18v drill DEWALT have made 18v Improved Brushless Motor, electronics and components for extended durability, efficiency and power delivering 112Nm and 1219w (using 6Ah) Software identifies battery pack and draws more current from Flexvolt packs to deliver more power 3 speed all metal gearbox designed to withstand the increased torque ge