Features 1、Secure Fixing: Can be mounted to a backing plate for use on a lathe or as a fixture on a mill, very safe and reliable. 2、Standard Size: Comes with 100mm diameter, this milling machine collet promises 0.005 high accuracy up for stability. 3、Perfect Match: Allows for wide utilization on CNC milling machine, turning tool, engraving machine and other equipment. 4、Good Material: Adopting high quality carbon steel material with good hardness, durable with oxidation and long using. 5、Easy to Install: Designed to have a light weight and a compact size as well, the installation is simple to complete. Specification Item Type: Collet Model: ER25-D100 Diameter: Approx. 100mm / 3.94in Accuracy: 0.005 Material: Carbon Steel Application: Used to hold tools. Package List 1 x Collet