The drill chuck is one of the main parts of electric tool industry and machine tool industry, widely used in electric drill, drilling machine. Chuck is connected with the tool, is used to clamp the handle type tool accessories. The drill and connection with threaded connections and taper connection in two ways. Threaded connection is mainly used on an electric hand drill, cone connection is mainly used for drilling machine drill chuck from structure can be classified as type wrench and keyless. Spanner drill chuck wrench to tighten the wheel needs, mainly used in machine tool industry, such as drill and drill. Hand drill chuck set to hold on and tighten the collet, mainly used for electric drill. Spanner drill chuck as by pulling wheel to tighten the collet and a pulling wheel is a with an extension arm of bevel gear, so in the process of screwing can serve to increase the role of input torque, so chuck clip clamping force is too large.