Greaseable Bolt w/ Hardware 9/16 Inch Thread X 4 Inch Long 4-pack RockJock 4x4RockJock's Greasable Bolts have been a staple in our Johnny Joint product line since it's inception in 1996! These bolts are used in many applications to grease Johnny Joint rod ends from the inside out (when the joint is equipped with an internally greasable pivot ball). Additionally, these bolt are used in leaf spring shackles, leaf spring main eye bushings as well as many, many other universal applications! All greasable bolts start out as a high