Six replacement push on type knob for split splined shaft pots. I was able to fit this knob to Genuine CTS 450G pots, '80s Marshall JCM800 Series pots and some recent Genuine Fender amp pots. Very dark brown almost black phenolic plastic knob features a silver top cap with black indicator line. I measured .770" diameter at the bottom, .616" overall height. The knobs on my '65 JTM 45 measure .542" diameter on the rim of the caps. Set of six knobs, pot not included.