An ER20 Collet 1/2 Inch is a type of collet that can hold a 1/2 inch tool or workpiece in a CNC machine, such as an engraving machine, a milling machine, or a lathe. A collet is a cylindrical device that has slits along the length that allow it to expand and contract. A collet can grip the tool or workpiece securely and accurately by applying a clamping force through a nut or a drawbar.
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