Dewalt DCF850 vs DCF840 6” lag

full video: DCF840 IMPACTS/MIN 4200 IPM MAX TORQUE (IN-LBS) 1700IN-LBS NO LOAD SPEED 3200 RPM TOOL HEIGHT IN TOOL LENGTH 5.1 IN TOOL WEIGHT LBS DCF850 IMPACTS/MIN 3800 IPM MAX TORQUE (IN-LBS) 1825 IN-LBS NO LOAD SPEED 3250 RPM TOOL HEIGHT 8 IN TOOL LENGTH IN TOOL WEIGHT 2.1 LBS