The development of a country is indispensable to the development of the machinery industry. Whether a country is strong or not, the development of machinery is the key. In the machinery industry, all machinery is connected with one thing. It is made of machinery and used for machinery. It is a stud.

The stud bolt is actually used as a containment medium. When it is open, its full circulation is straight through, and the pressure loss of this time-division medium is minimized. The same as the stud bolt is suitable for situations where there is no need to open and close frequently, and it is possible to collide and close the shutter to open or close. The studs are not suitable for use as adjustments or shackles.