null Skip to main content

Boss Style Knob - 1/4" Smooth Shaft (33mm OD)

Bulk Pricing:
Buy in bulk and save
Selected Choose your color is
Adding to cart… The item has been added



Get the classic fluted Boss-style knob in a 33mm outer diameter. A removable film protects the mirror cap and keeps it shiny in transit, and a brass cup insert with a flat-head set screw securely holds it to a 1/4" smooth shaft potentiometer.

The Specs:

Boss style knob


Black with white indicator, clear with black indicator

For 1/4" (6.4mm) smooth shaft pots

16mm (.62") tall

33mm (1.29") outer diameter at the skirt

Note: I've got four different sizes of classic fluted Boss-style knobs, from small (20mm) to extra-large (45mm). Check out the measurements below for a size comparison.

Small: 20mm x 11mm

Medium: 27mm x 16mm

Large: 33mm x 16mm

Extra-large: 44mm x 20mm


Tip: The term "Boss" refers to the aesthetic design of this knob, with the mirror cap inset into a plastic knob shell. A Boss-style knob will not automatically fit all Boss pedals. The right fit depends on the shaft size of the knob's potentiometer. Read this post to figure out what kind of knob you need: