Knee type vertical milling machine (model B1-400K) is an ameliorated product based on old X53k. The X53k was awarded ”Trustworthy Quality Product” by the Machinery Ministry. This machine with steady structure and favorable capability is easy to operate, applicable to all kinds of mechanical process. It is widely suited for flat surface, grooves and gears. Accessories such as rotary table and indexing head etc. will enlarge application of machine.