This listing only for the interior socket.Lamp parts: medium-based interiorkeyless socket-single circuit(you need a separate switch to turn off and on). Bottom cap has 3/8"threaded hole that works with standard 1/8 IPS pipe. No set screw. We combine with other items to save shipping costs. $1.44 each.Shipping is $3.10 plus $.10 for each additional piece.Combined shipping- to get cheapest shipping costs (when buying different items)please buy what you need (WITHOUT SHOPPING CART) and “request invoice” (BEFORE YOU PAY)so we can send invoice with lower shipping costs.SHOPPING CART DOES NOT SEEM TO WORK FOR COMBINED SHIPPING.
