Almost every job in a house comes down to two actions: making a hole, and driving a fastener. A drill does the first well and the second badly, which is why the screws you sink with one end up chewed, over-driven or snapped. This set gives each action its own tool and puts both on the same 18V battery.
The drill/driver is the one you reach for first. 400 in-lbs of torque, a 1/2 in. chuck, and 20 clutch settings — the collar you turn to tell it how hard to push before it lets go, which is what stops a screw head being ruined or a cabinet panel being split. Its head is only 6.3 inches long, so it works overhead and inside a carcass without your wrist paying for it. The impact driver is the one that surprises people.
It hammers rotationally as it turns, so it puts 1800 in-lbs into a lag bolt without twisting itself out of your hand the way a drill does. The head is 4.9 in. long — short enough to fit between studs and inside a cabinet where a drill simply will not go — and the trigger is variable, so the same tool that drives a 6 inch bolt will also start a small screw without launching it. Both motors are brushless: no carbon brushes to wear down, less heat, more of the battery going into the work.
Two 18V 2.0 Ah lithium-ion batteries come with it, so one is charging while the other is on the tool, along with the charger, two belt clips and a bag to keep it in. The whole kit weighs 4.26 kg.