Package quantity: sufficient components to fit on a skateboard or longboard and enhance bearing performance. Speed sp: our skateboard sp allows secure axle nut positioning, reducing play and improving bearing life, durability, and performance; +/-0.02 mm precision tolerance ensures a precise fit and smooth operation. Speed rings: our speed rings help increase speed and extend bearing life by minimizing friction between the bearing, axle nut, and truck hanger. Axle nuts: our axle nuts help prevent wheels from loosening; frequent wheel and bearing changes can cause wear and loss of tightness over time. These standard-size axle nuts are designed to maintain secure fastening and are compatible with most skateboard and longboard trucks featuring 8 mm axles. Each truck typically has a standard 8 mm axle. These axle nuts have thread dimensions of 5/16 inch. Wide application: this skateboard tool kit is compatible with most skateboard and longboard trucks. Components are durable and, when properly installed, resistant to stripping. Functionality: this skateboard hardware set helps reduce play and enhances the longevity, durability, and performance of your bearings. A useful addition for skateboard wheels, providing convenience and reliable function. Quality material: our longboard truck hardware kit is made of aluminum alloy, offering durability, stability, corrosion resistance, and resistance to stripping for long-term use. Color: silver + black Material: aluminum alloy Size: sleeve inner diameter 8 mm, height 10 mm Package Contents: 8 x Skateboard sps 8 x Axle nuts 40 x Speed rings Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.