An introduction to angle drills: Angle drills are used for drilling holes in wood, metal or plastics in tight or confined spaces. Most angle drills have a fixed 90 degree angled head although a variable head position tool is available. Angle drills have come into their own since electrical regulations required electrical wires to run through holes in the joists rather rather notching holes in the top of joists, so much so, they are sometimes called joist drills.
To choose between angle drills: The key consideration when selecting between angle drills is the maximum drilling diameter required. 13mm refers to maximum drilling diameter in steel, you can use a larger drill bit for plastic & wood providing it has a 13mm or smaller diameter shank to fit the chuck. The drill bit is tightened into the chuck using a key supplied.
To make sure you’ve got the right angle drill – 13mm keyed chuck: Choosing your power source: 240v tools are used with normal mains power whilst 110v tools are used on construction sites for safety reasons.
Additionally there is often a choice between single or 2 speed gears. Most angle drills have a variable speed function.