300W Max - 120V Rotary Dimmer Switch with Plastic Housing and 1/4in long shank. Includes both Black and Gold Knob. For Incandescent/Halogen ONLYthe knob portion measures approximately 6mm (0.23in) and the shank measures approximately 6.70mm (0.26in) *Please Note: Dimmers are NOT Returnable. Dim... See More