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16" steel pipe for making lamps- this is a basic 1/8 IPS (3/8" outside diameter)for making lamps that is threaded 1/2" on each end. This is for 16", but we also have 5" through 24" (in 1/2" ). We also have steel all-thread nipples 1/2"- 6" long.We do combine other items to save freight. $2.10 each.Shipping is $3.55 plus $.68 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” so we can send invoice with lower shipping costs.SHOPPING CART DOES NOT SEEM TO WORK FOR COMBINED SHIPPING.