In the Charlie Chaplin film Modern times, Charlie Chaplin's character works in a factory at an assembly line. He's standing in front of a conveyor belt. The belt carries objects that look like a thick rectangular metal plate, about 0.3 m long, with two big nuts sticking out from its top, and no other features visible. Chaplin is holding a ring wrench in each of his two hands, and loosens the two screws on each object with one swift motion. The worker after him strikes each object once with a hammer and chisel.
Are the objects that they are making supposed to be recognizable? What are they?