Buy BZP - Metric 8.8 Grade Studding online from Parker Tools DIY Tool Shop, a leading supplier of BZP - Metric 8.8 Grade Studding for Industry and DIY users. A type of metal fastener has threads cut into both ends and is known as steel threaded bars/rods. These rods resemble a screw but are longer and thicker. The diameter is the same along the complete length. They are at times referred to as all-thread or sometimes simply studding. The threaded rod is mostly used to fasten wood or metal together. It acts as a fixing pin to connect two materials together. They are also used to stabilize structures by inserting them into concrete or wood during repair. Threaded rods serve as the best method to hang sheet metal ducts or any other equipment.