1、Fitment: Spring shackle bolts is applicable for most trailer axles from 2000, 3500, 5200, 6000 and 7000 Axles, please confirm whether your model is applicable before buying. 2、Knurled Design: Spring bolt is designed with knurled shoulder, prevents bolt from spinning in hanger bracket. Includes grease zerk and lock nut. 3、Function: Greaseable spring bolt can keep trailer suspensions lubricated, which convenient for mounting double eye or slipper style axle springs to hanger brackets or equalizers. 4、Premium Material: The spring shackle bolt is made of high strength steel material, erosion resistant, anti deformation, wearproof, has long use life. 5、Package Including: The package includes 6pcs spring shackle bolt, easy to install, eliminating complex set up procedures, saves you time and effort.