Musiclily Dome Knobs, Side Screw Type, Metric Size, for Electric Guitar/Bass, Black (Set of 4) I purchased these with the wrong size, so I'm selling them unused. I opened one, but the other three are still in their bags. Although they are unused, they have been in someone's possession, so I've listed them as "Like New." The following is extracted from the website: I will not be offering a discount. Thank you for your understanding. [Additional Note] The bonus picks were missing from the group photo, so I've added them in the second image. * Suitable for Squier Strat/Tele/Precision Bass/Jazz Bass, and many other similar style import electric guitars and basses. * Metric size, coarse 18-spline, fits most Asian/European 6mm split shaft pots like Alpha. Not suitable for American inch-size pots like CTS. * Outer diameter: 18mm, Inner diameter: 6mm, Height: 18mm * Material: Steel, dome top, knurled, good feel, knobs that are fixed to the shaft with screws. When attaching these knobs to a split shaft pot, you need to tighten the screw to match the gap in the shaft's groove. * Package contents: 4 guitar knobs