Features: Achieve precise and efficient engraving with this ER11 Spring Collet Set. Made of high grade steel, it ensures durability and stability during high temperature operations. The unique concave design of the collet chuck prevents dust and iron debris from affecting the accuracy of the tool holder. With its hardened construction, it offer excellent hardness and toughness, preventing deformation and cracking. Designed for professionals and DIY enthusiasts, this ER11 collet set is perfect for milling machines and engraving tool. It provides a strong clamping force and wide ranges of sizes, ensuring high precise in various applications. Whether you're working on home renovations or industrial projects, this ER11 collet set is a must have tool. Upgrades your machining capabilities with the versatile ER11 Spring Collet Set. Its comprehensive ranges of sizes and exceptional precise will improve your craftsmanship. Specifications: Material:High-carbon Steel Option Type:ER11-3PCS(4mm,6mm,1/8mm) ;ER11-7PCS(1-7mm) ;ER11-13PCS(1-7mm) ;ER11-15PCS（13PCS+1/4mm,1/8mm) Built in self-release design and tool will never get stucks in holder Package Includes: Package A 3PCS ER11 Spring Collet; Package B 7PCS ER11 Spring Collet; Package C 13PCS ER11 Spring Collet; Package D 15PCS ER11 Spring Collet; note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.