Reporting question for Potentiometer - CTS, Linear, Knurled Shaft, 3/4" Bushing

Product:
Potentiometer - CTS, Linear, Knurled Shaft, 3/4" Bushing

Question:
on these CTS pots with knurled shafts - the data sheet says 1/4" shaft but the knurled part says 6mm - do these take 6mm knobs or 1/4" knobs?