Package : enough to fit on a skateboard or longboard and improve bearing performance. Speed : skateboard 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: speed rings can increase speed and extend bearing life by reducing friction among the bearing, axle nut and hangar. Axle nuts: 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 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 , durability and performance of your bearings. for your skateboard wheels, this kit, bring much to your life. Quality material: 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.