Features 125mm Diameter: Enhance precision with a 125mm diameter ER50 collet chuck, suitable for CNC milling machines, ensuring accurate and reliable performance. 7 Hole Structure: Experience a secure hold with the 7 hole structure, minimizing the risk of loosening during and improving overall accuracy. Premium Carbon Steel: Benefit from strong oxidation resistance and durability with the premium carbon steel construction, providing long-lasting performance and high hardness. Quick Installation: Save time with the threaded chuck design, allowing for swift and effortless installation and removal for seamless application switching. Multi-Purpose Usage: Versatile functionality allows for mounting on a lathe or as a fixture on a mill, ensuring adaptability for various machining needs. Features: 1、125mm Diameter: This collet chuck is 125mm in diameter with 0.005 high accuracy, mainly used for CNC milling machine tools. 2、7 Hole: The 7 hole structure can firmly lock your milling machine during use, not easy to loosen, and the accuracy is higher. 3、Carbon Steel Material: Made of premium carbon steel, the is quenched and blacked, feature strong oxidation resistance and high hardness. 4、Quick Installation: The threaded chuck allows for quick and easy installation and removal, saving you time when switching between applications. 5、Multi Purpose: Mount this collet chuck to a backing plate of your choice for use on a lathe or as a fixture on a mill. Specification: Item Type: Collet Chuck Material: Carbon Steel Model: Seven Holes Diameter: Approx. 125mm/4.9in Accuracy: 0.005 Package List: 1 x Collet Chuck Package List 1 x Collet Chuck