This Quibis 122 series potentiometer knob is the perfect addition to your electronic components. With a pointed shape and a diameter of 31mm, it is compatible with a 1/4" 6.35mm shaft hole. The knob is made of a durable plastic and brass bush material, and features a black or white line pointer for easy visibility. This unit type potentiometer knob is a passive component, and can be fixed with a allen grub screw. It is sold as a unit quantity of 1, and is ideal for use in electronic equipment..