Apart from the quality of the materials, these pot knobs are very elegant once installed. They are slightly smaller than the standard black speed knob (the plastic kind with the built-in number dial), and are much better for it. The grub screw means they are excellent for use on push-pull knobs - in many MANY hours of operation, they did not loosen at all. These were so pleasing, I believe I am unlikely to use any other brand again.