These OKW Top-Knobs Black/Grey 6mm Bore Hole are ideal for rotary potentiometers with shaft ends and offer a unique design courtesy of the invisible, side screw fixing using a stud with hexagon socket (1.5mm) and cup point. Manufactured with PA6 reinforced material and a slot allowing for a an individual marking element to be clipped in. This knob cannot come into contact with any live components.