●Mainly used for amplifiers, effect pedals, stomp boxes, etc ●Knobs have metal set screws. Fits common 1/4" medium shaft imperial size pots Fits most American Amplifier/Pedal devices and USA CTS / Fenders / Bones / Dimagio Standard Pots ●Make sure your potentiometer should be inserted in the correct position if there is a split shaft ●These knobs are made of Bakelite, stronger and heavier than plastic ●Package included: 6pcs