Designed for your leaf suspension system. Shackle bolts secure your spring to the hanger or equalizer (sold separately). This is a dry ( non-greaseable) shackle bolt. 9/16"-18 Thread 9/16"-18 Shank Diameter 3.5" Long Includes matching flanged nut Dexter Compatible p/n Bolt - 007-003-00 Nut - 006-007-01