Package quantity: sufficient quantity to fit on a skateboard or longboard and improve bearing performance. Speed spacer: our skateboard spacer allows for proper axle nut alignment, reducing play and enhancing bearing life, durability, and performance. The ±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 reducing friction between the bearing, axle nut, and truck hanger. Axle nuts: our axle nuts help secure your wheels in place. With frequent wheel and bearing changes, axle nuts can wear out and lose 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 size. These axle nuts have thread dimensions of 5/16 inch. Wide application: this skateboard hardware kit is compatible with most skateboard and longboard trucks. When properly installed, the components are strong and resistant to stripping. Functionality: the skateboard hardware set helps reduce play and improves the longevity, durability, and performance of your bearings. A useful addition for skateboard wheel maintenance, providing convenience and reliability. 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 × skateboard spacers 8 × axle nuts 40 × speed rings Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display settings may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may vary by ±1–3 cm.