Silver lamp part kits enable you to turn almost any bottle into an electric lamp. (You need to make sure rubber adapter will work with the size of your bottle opening.) These pre-wired kits come with 8 ' silver cord,push-thru nickel plated socket, 3 different sized rubber adaptors, 1 1/2" steel nipple, check ring and knurl nut. The diameter of the adapters are: 9/16", 3/4", and 15/16". Adapter squeezes into bottle hole, then your able to push nipple into the hole of the adapter. We ship with other items to save shipping costs.$7.30 each. Shipping is $3.90 for one and $.82 for each additional kit.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.