Collet Chuck Holder ER16M CNC Milling Tool Extension Rod Straight Shank with Wrench for Lathe 1DURABLE MATERIAL: Collet chuck holder is made of excellent manganese steel material, surface quenching black treatment, possess strong oxidation resistance, high hardness, long service life 2APPLICABLE SCENARIO: Long handle collet chuck holder is suitable for deep hole machining and can solve the need for extended deep machining 3APPLICABLE SIZE: CNC milling extension rod is suitable for ER16M chuck, easy to install, even if you are a novice can be easily removed for convenience 4INCREASED EFFICIENCY: Milling machine chuck holder has straight shank, clamp nut, are the machining products that make your work better, more efficient and more durable 5PERFECT REPLACEMENT: The ER16M chuck is a good replacement for older parts and can be used in CNC milling machines, useful and practical