The locking nut feature of this copper collet chuck provides added security, ensuring your bits stay firmly in place during use. Its compact design makes it easy to handle and maneuver, even in tight spaces. Whether you're working on detailed craft projects or heavy-duty grinding tasks, this delivers consistent performance and reliability. 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) -Enhanced machining accuracy: precision clamping design ensures stable work piece holding, boosting processing precision - thermal conductivity: copper core structure offers excellent heat dissipation, extending the ' life -Flexible work piece handling: lock nut adapts to various diameters, increasing operational flexibility -Ideal for precision tasks: suitable for metal engraving and grinding, meeting the demands of professional users -Convenient operation: compact and easy to use design, suitable for home diy projects and industrial applications Package list: 2 x nuts, 1 x chuck, 10 core, 2 x wrench