Features Rugged Construction: The ER20 extended shank and collet are made fromexcellent alloy steel, which ensures exceptional strength and durability. This robust construction makes the tool highly stable for demanding cutting applications, providing consistent performance. Standardized Nut Design: This ER20 extended shank adheres to international standards, utilizing the ER20 nut to securely lock the ER20 collet in place. With a clamping range of 1-13mm and a bore diameter of 3/4 inch, this design allows for versatile use with a variety of tools, making it a good choice for accurate work. Broad Applicability: The ER20 extended shank and spring collet are designed for extensive use in various cutting and machining processes. It is suitable for use with engraving machines, milling machines, and other equipment, making it an essential tool across multiple industries. Excellent Performance: The high strength and erosion resistant properties of the ER20 extended shank and collet ensure that it can withstand harsh working environments. This makes it suitable for applications in challenging conditions, where durability and performance are important to success. Compact And Practical: This extended rod and collet chuck are designed with practicality in mind. Its compact size makes it easy to store and transport, while its multifunctional capabilities enhance its utility in various projects. Whether for professional use or handcraft applications, this tool offers convenience without compromising performance. Specification: Item Type: Spring Collet and Collet Chuck Extender Rod Material: Alloy Steel Application: Engraving Machine, Carving Machine Clamping Range: Approx. 1-13mm / 0.04-0.51in Diameter: Approx. 3/4in / 1.91cm How to Use: Take out the product for direct use. PackageList: 1 x Collet 3 x Extender Rods 4 x Storage Boxes Package List 1 x Collet 3 x Extension Rods 4 x Storage Boxes