High Precision Spring Collets, Extensions, Adapters Holders and Retaining Studs for CNC Machines are made by Amana Tool, the leading manufacturers of cutting tools. All spring collets are inspected for quality & 100% accuracy. 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. Use Amana Tool WR-120 CNC Replacement Mini Wrench for TE-100, TE-104 and TE-106 ER Collet Holder Extensions. SPECIFICATIONS: For Tool #: TE-100, TE-104 & TE-106; For Use With: ER-20.