Designed to drill holes and drive screws, drill-drivers are versatile tools that are suitable for the bulk of household DIY. They have keyless chucks that will accept a large variety of bits, and a slip clutch that lets you adjust the torque settings for precise, consistent screw driving. This can be useful for constructing flat-pack furniture, for example. G Gears Drills with two gears tend to be best for slow, controlled screwdriving. The first gear gives low speed and high torque, which is what you want for screwdriving. The second gear gives high speed and low torque, which is best for drilling into tough materials. To switch between gears, release the trigger and allow the drill to come to a complete stop, then slide the gear switch to the setting you want to use.