1Application: Trailer axle spring shackle bolt can be widely used on most trailer axles from 2000, 3500, 5200, 6000 and 7000 Axles. 2Applicable Size: Trailer axle spring wet bolts, 9/16in diameter, 3in length, upgrade spring and shackle bolt for regular trailer leaf springs (1?3/4in wide). 3Main Function: Suspension bolts attach the leaf springs to the front or rear hangers. The included locknut is secured in place on the bolt. 46Pcs in Total: The package includes 6pcs trailer leaf spring shackle bolts, enough for one single axle trailer, with stable performance. 5Long Service Life: The spring shackle bolt is made of high strength steel material, rustproof, anti deformation, wearproof, has long use life.