Every time I buy a new guitar I fit these knobs to it. I currently have two teles, a couple of archtops and a strat equipped with them. I like the grooved surface, perfect for rolling off/on with the pinkie, I've never got on with traditional speed knobs, and the thinner radius of these I much prefer. These particular ones have a grub screw to tighten against the pot shaft. They have the wider radius cavity so they fit the solid shafted pots better than the split shafts. I've used cheaper versions bought from an auction site but the quality of the Thomann ones greatly surpass the cheapos. Highly recommended.