The quick changing tool post is a major spare part of lathe.It is composed of cutter-cartridge body and tool holders for various cutting tools wihch can replace the square tools table for processing works such as cylindrical facing, end facing, cutting, knurling, drilling, enlarge-boring and reaming, etc.The height of tools can be regulated adn positioned relative to the center line of machine spindle.It features external tool mounting, tool matching, quick tool changing (within 3 to 5 seconds), great precision in positioning and great hardness , etc.