1/2 INCH X 4" INCH BLACK PIPE Pre-threaded both ends NPT thread. 4" is tip to tip. These black pipes are great to construct furnitures and fixtures such as rustic shelves, hooks, clothing racks, towel bars, table legs, curtain rods and chic custom furniture that will totally show off your creativity can create lasting impressions. Choose from our comprehensive list of pipes, connectors and kits. Bring fun and cultured vintage industrial style into your home, office, store front, garage, workshop or any interior space with FixtureDisplays. Choose from our large selection of fittings, nipples and connectors to create one of a kind, custom furnishings limited only by your imagination.