I have repaired old machine tools and chose lost knobs because they are lost. I bought it for the first time, is it a standard product? It was exactly the same as the knob attached to the machine tool 50 years ago. It really matches the old machine with a wind body called a metal knob. I am glad that it was not a nobstar so I chose this one. Chrome plating is done, but the material is cast iron, the processability is very good. It is natural, but because it is a hexagon it will take properly for the three latch chuck of the lathe. Since it is machined from the outer periphery, it gets out only by gripping the core.