Brass-plated full-range dimmer socket fits standard lamp without any modification. Controls light from off to bright. Eliminates the need for a 3-way bulb.It does have set screw. These are made bySun-lite in China and are rated 150W-120 VAC -incandescent only. 3/8" threaded hole works with standard1/8 IPS pipe.. We combine with other items to save shipping costs. We sell for less in lots of 4- see our store. $12.92 each.Shipping3.10 plus $.16 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.
