Package quantity: enough quantity to fit on a skateboard or longboard and improve bearing percompatible withmance.Speed spacer: our skateboard spacer allows you to rotate the axle nut downward all the time, thus reducing slop and increasing bearing life, durability and percompatible withmance;The +/ -0.02 mm precision tolerance ensures nicely fit and very fast bearing at a time.Speed rings: our speed rings can increase speed and extend longer bearing life by reducing friction among the bearing, axle nut and hangar.Axle nuts: our axle nuts will prevent your wheels from falling off, the more you change your wheels and bearings, the more the axle nuts wear out and lose its tightness; These standard size axle nuts will keep you locked up and will fit most skateboard/ longboard trucks with 8 mm axles (in fact, each truck has a standard 8mm axle size); These axle nuts have thread dimensions of 5/16 inch.Wide application: this skateboard tool kit can be applied compatible with most