Feature:1.Spring collet performance stability, high accuracy.2.Hardened and precision ground.Powerful clamping ability.3.Built in self-release design and tools will not get stuck in holder.4.Widely used, for CNC milling lathe tool & workholding engraving machine.5.Each collet with a separate protective container.6.Convenient to install, no need for tools, just with your bare hands, the spring collet can be effortlessly installed and disassembled.Model: ER11Material: High grade 1065 carbon steelRun-Out Tolerance: 0.015MM(0.0006")Size: 1/16", 3/32", 1/8", 5/32", 3/16", 7/32", 1/4"Package Included: 7x ER11 collets