Dimmer Knob For Push-On D-Shaped Shaft, BlackProduct Details:Body Color: BlackMaterial: PlasticShaft Configuration: D Shaft, No Insert or Set Screw, Not SplinedView the Rear Image to see if the Knob is Compatible With the Stem on Your ControlKnob Base Diameter: 1.45″ Tapers To 1.4″ on TopHeight: 0.6″Shaft Size: D Shape 0.25″ x 0.17″ Flat SizeShaft Depth: 0.5″With Line on Face, No Markings on KnobUNKRP10722