An introduction to drill drivers: The drill driver is the most basic cordless drill (see rotary drills for their mains equivalent). They are used for drilling holes in wood, metal or plastics as well as driving screws.
To choose between drill drivers: The key consideration when choosing a drill driver is the maximum drilling diameter required. Drill drivers with 1/4″ hex drives; the drill bit fits straight into the machine rather than tightened into a chuck. 10mm refers to maximum drilling diameter in steel, you can use a larger drill bit for plastic & wood providing it has a 10mm or smaller diameter shank to fit the chuck. A keyless chuck is tightened by hand.
To make sure you’ve got the right drill driver – 10mm keyless chuck: Choosing your power source: 240v tools are used with normal mains power whilst 110v tools are used on construction sites for safety reasons.
Most professional drill drivers have a variable speed function and a variety of torque settings. Additionally there is often a choice between single, 2 or 3 speed gears; a low speed and higher torque setting is used for screw driving whilst a higher speed is used for drilling metal or wood for example. Combi drills and impact drivers have higher torque settings.