1、The product is made of high quality metal and has high hardness. It is suitable for long-term use and will not affect the accuracy of the work. 2、Extended straight shank type handle, with longer handle body. 3、Suitable for deep hole processing，to solve extend depth of processing need. 4、For reducing the using of extended cutting tool, reduce the cost of processing, increase efficiency 5、Various details of the product are carefully handled to ensure the stability and accuracy of the product. Feature: The product is made of high quality metal and has high hardness. It is suitable for long-term use and will not affect the accuracy of the work. Extended straight shank type handle, with longer handle body. Suitable for deep hole processing, to solve extend depth of processing need. For reducing the using of extended cutting tool, reduce the cost of processing, increase efficiency Various details of the product are carefully handled to ensure the stability and accuracy of the product. The extension rod diameter and other part all through precision grinding, eliminate unbalance, to increase security when cutting. Specification: Model: C16ER16A-100L; C16ER20A-100L(Optional) Rod length: 100mm Chuck rod diameter: 16mm Internal diameter of chuck  rod: 10mm Package list: 1 * Chuck Holder Note: Meaning of model, for example: C16-ER16A-100L,  (C stands for the diameter of the shank, C16 = shank diameter 16mm, ER16 refers to the chuck with ER16 model, A= refers to the nut is hexagonal, 100L refers to the length of the shank, not the total length) The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.