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<ul><li>Pro Series 12 Piece ER-20 Spring Collet Set With Rack (3901-5364)</li><li>Runout is </= .0002"/.005mm.</li><li>Collets include 1/16-1/2".</li><li>Made of high grade alloy tool steel.</li><li>Hardened and precision ground to 44-48HRC.</li><li>Surfa