An introduction to combi drills: The combi drill combines a hammer action and drill driver function enabling drilling into concrete and brick as well as wood, metal or plastics. Combi drills are cordless; see percussion drills for their mains equivalent.
To choose between combi drills: The key consideration when choosing a combi drill is the maximum drilling diameter required. 10mm refers to maximum drilling diameter in concrete & brick. You can use a larger drill bit for metal, plastic & wood (& some machines allow this in concrete & brick too) 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 combi drill – 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 combi drills 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.