Wuxi Jiutian Machine Tool Factory was established in 2001, which is specialized in the production of machine tools (accessory). It devotes continuously to the research and development of precise quick-changing chuck of high-performance and high-efficiency drilling and tapping. Through 15-year research on quick-changing chuck and technology accumulation of chuck manufacture, it has gotten certain technical achievements on the technology of high-efficiency chuck of drilling and tapping. Our factory has successfully develop the only kind of handle-type full-cone chuck which can manually change the knife tools with high performance and no gap, and then has applied for national invention patent. This chuck is convenient and efficient, which has high precision, compact structure, and long service life. It is the upgrading product for hole processing in the modern and traditional machining, such as drilling, enlarging, reaming and tapping. All performances of common quick-changing chuck are improved into the unprecedented new height. This kind of product is especially applied for higher-precision digital controlled driller, common driller, boring mill and drilling machine.