Auto Meter 9114 LED Lighting Dimmer Includes 4ft. Wiring harness. 0.250 in. Control Shaft, knob not included. Black Composite Case: Dimensions - 2.380 in. x 1.250 in. x 0.750 in. (1.375 in. from bottom of case to tip of control shaft) Utilizes two mounting holes (0.187 in.) located 2 in. on center.