Dimmer Lamp Rotary Socket 100W Converts any lamp to full range dimming. Range from night light to full brightness. Eliminates the need for expensive 3-way bulbs. Compact size fits most lighting fixtures. Screws in, no wiring required. Incandescent bulbs only. Manual dimmer. 100 watts m aximum. Plastic housing. 2.5" x 2.08" x 1.96".