Package quantity: enough quantity to fit on a skateboard or longboard and improve bearing performance. 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 performance;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 for most skateboard/ longboard trucks, they are strong and with proper installation, are resistant to stripping. Effectively:The skateboard hardware set can reduce slop and increase the longevity, durability and performance of your bearings. Essential for your skateboard wheels, get this kit, bring much convenience to your life. Quality material:Our truck longboard hardware kit is made of aluminum alloy, which is durable and stable, corrosion resistant, and not easy to strip, you can use it for a long time. Colour: silver + black Material: aluminum alloy Size: Sleeve inner diameter 8mm height 10mm Package Contents: 8 * Skateboard spacers 8 * Axle nut 40 * Speed ring Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.