The toothed chuck is a mechanical part of the drill designed to hold and firmly clamp work tools such as drill bits or screwdriving bits. Its characteristic feature is the toothed ring around its circumference and the need to use a special tool, the so-called 'crank', for tightening and loosening. The crank has a tooth at its end that fits precisely into the teeth on the chuck's wreath. Turning the handle moves the inner jaws of the chuck, which either grip the shank of the tool or loosen it. This mechanism allows a large clamping force to be exerted. As a result, the tool is clamped very tightly and the risk of slipping during work is minimised, which is particularly common when drilling in hard materials such as metal or when using large diameter drill bits. Changing the tool is slower than with quick-release chucks, which are tightened by hand only, and requires the handle to be always available.
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