Fully Threaded Rod, Material Steel, Finish Zinc Plated, Thread Size 1/4 In.-20, Overall Length 3 ft, Tensile Strength 65,000 psi, System of Measurement Inch, Thread Direction Left Hand, Includes Nuts No, Minimum Yield Strength 57,000 psi, Number of Nuts Included 0, Rockwell Hardness B100 Max Left-hand fully threaded rods and studs have threads that run in the opposite direction from standard threads. They are commonly used to connect parts together that require extended reach or lengths in applications where counterclockwise movements would cause right-hand threads to back out.Steel fully threaded rods and studs are fasteners that provide good strength and durability for a variety of everyday fastening applications. They are made to meet certain strength requirements, indicated by an ASTM.