Offering a large selection of Metric and Inches HIGH PRECISION CNC Spring Collets in ER and RDO Styles. All spring collets are inspected for quality & 100% accuracy. Standard 0.0004" T.I.R. The high precision spring collets allow to reduce the vibrations on the tools and motors, assure better results and prolong the life of the tools and electrospindles. The high precision spring collets used on Amana Tool's high precision toolholders give you the very best performance.