B&P Lamp Heavy Turned Brass Socket with Brass Knob, Polished and Lacquered Finish, 3-way function, UNO thread shell , These high quality, UL listed lamp holders are specially designed for use in the manufacture and restoration of fine table and floor lamp lighting, Each style comes with a threaded cap and shell for superior strength and beauty, These are the lamp sockets of choice when mounting UNO fitter style lamp shades to bridge arm floor lamps, Large solid brass turn knob style switch with on/off or 3-way interior and UNO thread or plain style shell