This gas valve knob is two inches in diameter. This is a chorme knob with white lettering denoting the off, simmer, warm, high, and light positions. This knob will accept a 'D' shaped shaft. Notes Fou...
Took knobs out of package, put them on surface burner. "D" side to "D" side. Very simple. Waited too long to look for the real thing. Problems everyday with the "universal" knobs sold in hardware stores. This site is only place I found the original replacement.