KNB1E3B-MM is a set of 4 black plastic bevel-top knobs that match the appearance of the original knobs shipped on Spector® (and other) basses. These are designed to fit the 6mm metric knurled shafts originally shipped on Spector basses®, and perfectly fits the bass and treble pots on LHZ preamps.
These knobs will also work with 1/4" knurl...