Are your nuts hard to turn? Are they grimey and gross? If you don't remember the last time you swapped them out, it's probably time for a fresh set. 
 
This kit comes with 4 tall axle nuts and 2 short kingpin nuts. All are grade 8 (which we HIGHLY recommend over anything else), and come pre-lubed with anti-seize. 
 
Pro move- clean off the threads of your axle/kingpin with a rag and some rubbing alcohol before installing new nuts. Careful not to let any alcohol get inside the hanger- it's a solvent and will break down the loctite that holds your axles in.