Concentric Stacked Black Aluminum Knob
These knobs fit on Bartolini and Aguilar preamps that have stacked (concetric) pots. Fits pots that have a lower shaft or 8mm and upper shaft of 6mm. Secures with set screw.Lower knob is 5/8"(15.9mm) wide 1/2"(12.7mm) tall, upper knob is 5/8"(15.9mm), approx. 3/4"(19.0mm).