The reason socket got this name is because it needs to be set on various accessories and it looks like cylinder. It is a commonly used tool for production, maintenance, and life. It is a convenient tool for locking bolts or nuts. On the other way, it can be classified into 6 corners and 12 corners according to the use end; divided into 1/4", 3/8", 1/2", 3/4", and 1" according to the driving end.