The Maker Pipe Structural Coupling Connector lets you turn ordinary 3/4 In. EMT conduit into strong frames and projects. The connector clamps firmly around two pieces of conduit to form an end to end joint. Two steel pieces fit together like a puzzle and are easily positioned anywhere on your build. Use a single 5mm hex wrench to make the connection or take it apart whenever you need. The zinc coated steel resists rust and is great for outdoor or indoor builds. Reuse the fitting over and over to build anything from garden enclosures to garage workbenches.