High-Quality Materials: The drill chuck is made of high-quality metal, making this keyless drill chuck sturdy and durable for long hours of use. Specification: Drill Chuck Diameter: 43 mm, Length: 71 mm, Link Size: 1/2-20 UNF, Clamping Range: 1.5 ~ 13 mm. Ergonomic Design: The keyless, self-tightening design is more ergonomic. The chuck holds the drill bit firmly and securely, preventing it from loosening easily. Easy to Use: This multi-purpose self-tightening drill chuck is easy to install and remove, making it simpler and less laborious. Ideal Accessory: Wide range of collet sizes from 1.5 to 13 mm, suitable for many types of drill bits. Due to human engineering, it is suitable for long-term use.