Amana Tool TE-100 CNC High Precision Tool Holder Extension 1-7/64 Dia x 1/4 Shank Dia x 1/4 Inner Dia x 5-7/8 Inches Long, Includes CO-276 for Collet ER-20 and Mini Wrench Go to amazon.com Related posts Top 13 best er20 collet wrench: Which is the best one in 2022? FeatureSold on Amazon DescriptionCNC High Precision Tool Holder Extensions