Detailed Product Description Detailed Er series collets:Made of special elastic steel materialpower clamping ability, precise accuracyused for boring ,miling ,drilling, tapping ,grinding and engraving operation etc Model D H7DD1D2LL1L2L3Collapsible pacacityER81.0-5.088.456.513.52.981.51.20.5ER111.0-7.01111.59.518.03.82.52.00.5ER161.0-2.5161713.827.56.264.02.70.52.5-10.0161713.827.56.264.02.71. ...