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What is chuck size?

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Blue cordless drill driver with a red circle around the chuck When selecting a cordless drill driver, you will probably come across the term ‘chuck size’. This refers to the maximum shank diameter the chuck will accept.
Grey hexagon with a double ended arrow across the centre The shank diameter of a bit is the measurement across the centre of the shank. Hexagonal shanks are always measured across their flats.
Grey circle with a double ended arrow across the centre The measurement for a straight shank’s diameter can be take from any point around the circumference.

What size chuck do I need?

Keyless chuck for a cordless drill driver Cordless drill driver chucks come in the following sizes:

10mm (3/8 inch)

13mm cordless drill driver chuck 13mm (1/2 inch)

Quite simply, the larger your chuck size, the larger shank diameter it will accept.

 Wonkee Donkee says "When first selecting a chuck, you should first find out the shank diameter of the bits you want to use, and then select your chuck size accordingly."
Yellow and black cordless drill driver with a 13mm chuck Generally, if you want to drill holes larger than 20mm in diameter or drill into materials such as metal, then consider purchasing a drill driver with a 13mm chuck, to accommodate larger bits.