Features 1、DURABLE MATERIAL: Collet chuck holder is made of excellent manganese steel material, surface quenching black treatment, possess strong oxidation resistance, high hardness, long service life 2、APPLICABLE SCENARIO: Long handle collet chuck holder is suitable for deep hole machining and can solve the need for extended deep machining 3、APPLICABLE 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 4、INCREASED EFFICIENCY: Milling machine chuck holder has straight shank, clamp nut, are the machining products that make your work better, more efficient and more durable 5、PERFECT REPLACEMENT: The ER16M chuck is a good replacement for older parts and can be used in CNC milling machines, useful and practical Specification Item Type: Collet Chuck Holder Model: C12-ER16M-100L and ER16M wrench Material: Manganese steel Package List 1 x Extension Rod 1 x Wrench 1 x Storage Box