They are for the split shaft push on splined type pot shafts, not the smooth ones, like you find on cheaper basses.
FLEOR Alnico 5 Jazz Bass Pickup Set (Neck Bridge 4 String) - Fender Jazz Bass
Bartolini 59CBJD L1/S1 5-string Classic Dual Coil Jazz Bass Pickup Set
1969 FENDER PRECISION / JAZZ BASS TUNER SET
Retrovibe Split Coil Jazz Bass pickup set covered alnico magnets
Hosco Fender Style Jazz Bass Control Knob Set 2 x Large 1 x Small with Set Scre…
Hosco Fender Style Jazz Bass Control Knob with Set Screw (Large)
