Features Practical Design: The OZ collet chuck has a full length slit that allows the chuck to fold evenly, providing a concentric and full 360 degree clamping surface. Wide Application: Widely used in machining centers, milling machines, CNC, engraving machines, high speed machines, and other processing applications. Durable Material: The spring clamp is made of premium spring steel material, which is resistant to high temperature, corrosion, and stable performance. Good Workmanship: After heat treatment and cold drawing hardening, the strength is relatively high, and it has a certain degree of flexibility and plasticity. Easy to Install: Comes with a compact size and a light weight as well, the spring collet chuck is very convenient to install in minutes. Specification: Item Type: Collet Chuck Material: Spring Steel Collet Specification: 1/2 1/4 1/8 Wrench Specification: 38~42 Package List:3 x Collet Chuck 1 x Wrench Package List 3 x Collet Chuck 1 x Wrench