Includes 8 axle washers, 4 bearing spacers, 4 axle nuts from Dimebag Hardware. Speed washers increase speed and promote longer bearing life by reducing friction between the bearing and axle nut and hangar. Speed Spacers increase speed and promote longer bearing life. Having spacers allows you to tighten your nuts down to eliminate wheel wobble and keep your wheels spinning smoothly and freely. Having brand new lock nuts will keep your wheels from falling off. The more you replace your wheels and bearings, the more the axle nuts wear out and lose their ability to stay tight. These fresh new nuts will keep you locked up! Produced with top quality materials. The thread size for these axle nuts is 5/16". This kit features products that are the standard size and will fit on all skateboard/longboard trucks that have 8mm axles (virtually every truck has the standard 8mm axle size). The 4 locknuts, 4 spacers, and 8 washers included are enough to outfit 2 trucks.