Package quantity: sufficient components to fit on a skateboard or longboard and enhance bearing performance. Speed spacer: our skateboard spacer allows for proper axle nut alignment, reducing play and improving bearing life, durability, and performance. Precision tolerance of 0.02 mm ensures a secure fit and smooth operation. Speed rings: our speed rings help reduce friction between the bearing, axle nut, and truck hanger, promoting increased speed and extended bearing life. Axle nuts: our axle nuts help secure wheels in place. With frequent wheel and bearing changes, axle nuts can wear out and lose grip. These standard-size axle nuts are designed to maintain reliability and fit most skateboard and longboard trucks with 8 mm axles. Each truck typically features a standard 8 mm axle. Axle nuts have thread dimensions of 5/16 inch. Wide application: this skateboard tool kit is compatible with most skateboard and longboard trucks. When properly installed, the components are strong and resistant to stripping. Functionality: this skateboard hardware set helps reduce play and enhances the durability and performance of your bearings. A useful addition for skateboard wheels, providing convenience and improved ride quality. Quality material: our skateboard hardware kit is made of aluminum alloy, offering durability, stability, and resistance to corrosion. The material is designed to withstand regular use and resist stripping. 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 differences may cause slight variations in color between the image and the actual item. Measurement tolerance is 13 cm.