Once a piece of metal is heated at high temperature and cooled down after that, residual stress happens, which may cause some distortion of the metal. To finish as the complete product, it is essential to discharge such residual stress. In order to discharge the residual stress remaining in the metal, heat treatment needed to be applied, then the product is cut into the predetermined size by using a lathe. After that, the product goes through such processes as cutting, rectification, outside polishing, cutting of an oil supplying groove, oil pocket making, hole drilling, inner lathe cutting and the like. Then, the product is delivered to the inspection process. Isoda Metal is fabricating products by using a variety of instrument in order to finish up high quality products that the customers expect.