Guyker NKB-008 Guitar Bell Control Knobs, 6 mm Brass, Old Brass, 3-Pack

If you need replacement controls for an electric guitar or bass, this Guyker set includes three bell-shaped knobs in an old-brass finish. They’re intended for tone and volume controls, so the set suits a repair or a coordinated refresh of several controls.

The listed inner shaft diameter is approximately 6 mm. Fit depends on the potentiometer shaft, so the product’s own fitting details matter before you order.

The knobs are made of brass and have a top-hat bell shape. That gives you a different look and feel from simply keeping worn or dirty controls in place, while keeping the focus on a familiar guitar or bass control layout.

What you’ll notice day to day

The bell shape is designed to sit comfortably in the hand, and the surface is described as providing grip for adjustment. In a practical setting, that means reaching for a tone or volume control during a rehearsal or practice session without changing the instrument’s basic controls. The set contains three knobs, which can be useful when replacing more than one at a time or matching a group of controls.

The old-brass color is a visual choice as much as a replacement detail. It may suit an instrument where you want brass-colored controls rather than a plain replacement knob. It makes sense if your current knobs are worn, dirty, or broken and the shaft fit checks out. If you only need one replacement, the three-piece set may leave you with extras.

What to know

The product information gives an approximately 6 mm inner hollow shaft diameter and also describes the knob as suitable for solid shafts. The manufacturer’s fitting note, however, refers to split-shaft pots with a diameter of 6 mm or less. Since those descriptions are not fully consistent, compare your potentiometer’s shaft type and dimensions with the attached parameter drawing before ordering. The stated fit range should not be treated as confirmation that it works with every guitar or bass.

The manufacturer lists Tele-style, LP-style, Epi-style and jazz bass or PB-style instruments as examples, along with similar instruments. Those references describe possible use cases, not a guarantee of fit for every version. Compared with choosing a knob solely for its appearance, matching the shaft specification is the more important step, a visually suitable control is not useful if it does not fit your pot.

Tips for day-to-day use

These knobs are intended for adjusting an instrument’s tone and volume, so consider whether the old controls are the parts you want to replace before changing anything else in the setup. For a DIY replacement, check the shaft against the drawing and confirm that the set’s old-brass finish works with the other hardware. The supplied details describe easy installation but do not specify tools or a separate installation procedure.

Before you decide

How many knobs are included? The product title and color details identify this version as a set of three. The manufacturer text also mentions more than one package configuration, so this listing’s three-piece description is the relevant one for this variant.

What shaft size is listed? The inner hollow shaft diameter is approximately 6 mm. The fitting notes also mention split-shaft pots measuring 6 mm or less, while another detail says solid shaft. Check the drawing and your pot’s shaft style to resolve that fit question.

Can these be used on a bass? The listing describes use with electric guitars and basses, including jazz bass and PB-style examples. Actual fit still depends on the instrument’s potentiometer shaft.

Buying verdict

Choose this Guyker set when you want three brass bell knobs for guitar or bass tone and volume controls, and the old-brass finish suits your instrument. The key decision is fit: the listing’s shaft descriptions differ, so use the parameter drawing and your pot’s measurements rather than relying on instrument style alone. It may not suit you if you cannot confirm a compatible shaft or need only a single knob.