ER-11 Collets. Precision Collets concentricity is 15 microns or 0.0005" TIR or better . Ultra Precision Collets is 6 microns or 0.0002" TIR or better. Concentricity is 13 microns or 0.0005" TIR or better. Manufactured with Swiss technology. Crafted from high quality European alloy spring steel. TRUE INCH and metric siz
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