"Catch the steel machine", as the name suggests, refers to the machine that grabs steel. The size of the fixed grabber is commonly called the "grab arm", which is generally long. The front end is the grabber, which is the gripper. It is also called the plum blossom hydraulic grab, the orange flap grab, and the fixed grabber. The main role is to carry out the loading and unloading operations of various materials such as scrap metal, industrial waste, crushed stone, construction waste and domestic garbage. It is divided into original steel grabber and assembly grabber.