This copper collet chuck is suitable for both professional craftsmen and hobbyists. Its sturdy construction and secure locking mechanism ensure your bits remain stable during intricate operations. Features -Color:Assorted Color -Material:Metal -Size:2.20X1.50X1.50cm/0.86X0.59X0.59in (Size 4486 chuck) -Size:1.50X1.10X1.10cm/0.59X0.43X0.43in (Size 4485 nut) -Size:1.60X0.60X0.60cm/0.63X0.24X0.24in (Size copper core) -Precision holding: ensures stable work piece clamping, improving machining accuracy and efficiency -Heat dissipation: copper core structure offers excellent thermal conductivity, effectively managing heat and extending life -Flexible clamping: lock nut adapts to various work piece diameters, enhancing operational versatility -Professional applications: suitable for precision tasks such engraving and grinding, meeting professional requirements -Easy to use: compact design and simple operation make it suitable for both diy projects and industrial use Package list: 2 x nuts, 1 x chuck, 10 core, 2 x wrench