Pirate Mfg Hot Rod Polished Billet Aluminum Dash Knob W/Set Screw Rat Rod Gasser Custom Brand New Polished Billet Aluminum Dash Knob This knob is 1-1/8" tall and 1" in diameter with a 1/8" mounting hole These are held on by a set screw on the side of the base Great for wiper switches, heater controls headlight switches etc Perfect for your off road, jeep, rock crawler, muscle car, street rod, dune buggy, or sand rail project.