ER20 Spring Collet Chuck Set — reliable, precise clamping for engraving machines and small routers Key benefits Secure, vibration-free hold: The ER20 collet design grips bits firmly to reduce slipping and runout, improving cut quality and repeatability. Wide size coverage: The set covers a 1–12 mm range so you can use a broad range of router and engraving bits without frequent adapter changes. Ready-to-use kit: Includes 12 collets in a holder for quick access to the sizes you need, speeding tool changes and minimizing downtime. Built for longevity: Quality construction provides consistent clamping performance and long-term durability for production or hobby use. Improved accuracy and efficiency: Stable bit clamping reduces tool chatter and measurement error, helping you finish jobs faster and with better results. What it does Clamps and centers router/engraving bits using the ER20 spring collet system. Accommodates various bit diameters in the 1–12 mm range. Serves as a direct replacement or upgrade for machines that accept ER20 chucks and collets. Compatibility and attributes Collet system: ER20 spring collet. Size range: 1–12 mm coverage across the included collets. Package: Set with 12 collets in a holder for organized storage. Function: Precise clamping for engraving machines and routers that accept ER20. Practical use scenarios Detailed engraving: Hold small-diameter carbide or HSS engraving bits securely for consistent, fine-detail work on wood, acrylic, or soft metals. PCB milling and prototyping: Maintain concentricity and reduce vibration when routing traces and slots on circuit boards. Sign making and trim routing: Switch between bit sizes quickly while producing clean edges and consistent cuts on plastics, composites, and soft wood. Why choose this ER20 set Eliminates bit slippage and reduces runout for higher-quality cuts. Simplifies workflow with a complete set of commonly used sizes and a convenient holder. Compatible with existing ER20-equipped engraving machines and routers, making it an easy, practical upgrade to improve performance.