Drill chuck

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A drill chuck is a self-centering, three-jawed device that specializes in securely holding drill bits or other rotary tools, typically with a capacity of 0.5 inches (13 mm) or less and rarely exceeding 1 inch (25 mm). This versatile chuck type is commonly used on a wide range of tools, from professional-grade equipment to affordable hand and power drills for household use; it's the type most people who don't regularly work with machine tools will be familiar with.