The quick change tool post is a main accessory of the machine tool. It consists of tool posts body and many kinds of tool holders, according to the processing requirements of the workpieces. The corresponding tool holders are selected to finish cylindrical facing, end facing, cutting, drilling, reaming, boring as well as other processing. It realizes to mount tool outside the machine tool. It has high precision and strong rigidity. The 40 position QC tool post (teeth type) and holders are also available.