Features 125mm Diameter Precision: This collet chuck boasts a 125mm diameter with 0.005 high accuracy, ensuring optimal performance for CNC milling machine applications Secure 7 Hole Design: The innovative 7 hole structure provides a firm grip, preventing loosening during operation and enhancing overall machining accuracy Durable Carbon Steel Construction: Crafted from premium quenched and blackened carbon steel, this collet holder offers exceptional oxidation resistance and durability for long-lasting use Effortless Quick Installation: Designed with a threaded chuck for easy installation and removal, this tool saves you valuable time when switching between different applications Versatile Multi-Purpose Use: Compatible with various backing plates, this collet chuck can be mounted on lathes or used as a fixture on milling machines for diverse setups 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 hardn. 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