Uses a hand operated crank handle to turn an interlocking gear, which in turn rotates the drill bit. With a quicker set-up time than the electric drill, the hand drill is most useful when you require only a small number of holes. Effective for drilling into wood, soft metal, and plastics, hand drills will generally accommodate most drill bits up to 6mm (1/4") in diameter in either keyed or keyless chucks, and can also be used for screwdriving. Some models incorporate two speed gears, double pinion, hollow handle to store bits, and fully enclosed gear mechanisms.