1. Key type drill chuck needs to be tightened with spanner wheel, which is mainly used in machine tool industry, such as bench drill and electric hand drill.

2. The key drill chuck is tightened by the key wheel, which is a bevel gear with an extended force arm, so in the process of tightening, it can increase the torque input, so the grip force of the chuck is large

3. The key chuck is widely used because of its simple structure, easy processing of parts, low price, reliable performance and other advantages.