Adjust the width of box plus locking handle with slide, adjust the width of face punching plug - chip regulator is used to ensure the piercing has always been at the center position.
盒体宽度的调节采用滑槽加锁紧手柄，冲孔面的宽度调节则采用塞片调节，保证冲孔始终在中心位。
2
The invention has the advantages of a double locking structure by use of the plug, the jack and the movable button, high safety and simple structure and is not easy to be lost.