Lamp nipple pack. Includes stainless steel 3/8"-24 hollow threaded stud with 1/4" inside diameter, 3/8" washer and 3/8"-24 nut. Allows you to attach your flexible gooseneck or rigid arm with a nut, rather than a screw, for pulling wires. The lamp nipple can also be used for attaching lamp sockets (not included) with standard 1/8 IP threads as shown in the 2nd picture. Although 1/8 IP threads are 27 per inch, our thread stud with 24 threads per inch is compatible. Lamp wires shown are 18 gage.