3 Jaw Chuck

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A chuck is a specialized type of clamp used to hold an object, usually an object with radial symmetry, especially a cylindrical object. It is most commonly used to hold a rotating tool (such as the drill bit in a power tool) or a rotating work-piece. Some chucks can also hold irregularly shaped objects. In some applications, the tool or work-piece being held by the chuck remains stationary while another tool or work-piece rotates.