15Pcs Guitar AMP Amplifier Push on Fit Knobs Black with Gold Aluminum Cap Top Fits 6Mm Diameter Pots Marshall Amplifiers Material: knobs is made of ABS; cap is made of Aluminum_x000D_ Total Height: about 16mm; Outer diameter at the base: about 20mm_x000D_ Fits Amplifiers with 6mm Shaft Pots, these knobs DO not fit 'D' shaft Pots_x000D_ Push on fit, no brass insert or set screw, Aluminum knobs are for sonic equipment or potentiometers, used to replace the dirty, shabby_x000D_ Due to the wide of amplifiers and parts in the market, please be to verify the diameter of the pots on your AMP you change the knobs for your amplifier size:Diameter 20mm, height 16mm, inner diameter 6mm_x000D_ Material:ABS, aluminum sheet_x000D_ colour:Black , Golden Package Contents:_x000D_ 15 x knobs Only the above package content, other products are not included._x000D_ Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_