New polished brass plated3-way turn knob socket (works with 3-way bulb) with set screw for wiring table or floor lamps. They come complete with socket, shell, and cap in a brass plated finish. Cap has standard threaded 3/8" that works with standard 1/8 IPS steel pipe. We sell for less in lots of 20, but you'd need to buy from that listing- see our store. We combine with other items to save shipping costs. $2.62 each.Shipping is $2.90 plus $.28 for each additional piece. Combined shipping- to get cheapest shipping costs (when buying different items)please buy what you need and “request invoice” so we can send invoice with lower shipping costs."How to Request Invoice when using shopping cart"---From your eCRATER cart, near the top of the page, move your mouse curser over our name “lamppartsguy” and a drop down menu will appear with the option to request invoice from seller.