Double-End Threaded Rod, End Type Straight , Material Steel, Finish Zinc Plated, Wrench Flats No, Overall Length 12 in, System of Measurement Inch, Thread Length A 1 5/8 in, Thread Length B 1 5/8 in, Thread Size A 5/16 In.-24, Thread Size B 5/16 In.-24, Rockwell Hardness B80 Min