Hand machined brass with a soft round head; slightly smaller than the “Broadcaster” and now with your choice of chrome or nickel plating. 8-32 slotted steel nickel plated set ,screw included. 1/4'' solid shaft.
I have had quite a few requests for this knob - seems some like the bullet/dome top look. The knurl was all over the place in "53," so I picked the one I liked. The knurl is a bit sharp so a one finger spin is easy. Hand machined the old way, by me. 1/4'' solid shaft.