Fully Threaded Rod: 1/2"-13 Thread Size, Steel, Black Oxide, Left Hand, 6 ft Lg

Left-hand fully-threaded rods and studs have threads that run in the opposite direction from standard, right-hand threads. They are used in specialized applications where reverse threads are required and where counterclockwise movement could cause right-hand threads to back out, such as in gas-supply valves, plumbing, and heating pipes.