Package quantity - package comes with 4 pieces skateboard spacers, 4 pieces axle nuts and 16 pieces speed rings, enough quantity to fit on a skateboard or longboard and improve bearing performance Speed spacer - this skateboard spacer allows you to rotate the axle nut downward all the time, thus reducing slop and increasing bearing life, durability and performance Speed rings - this speed rings can increase speed and extend longer bearing life by reducing friction among the bearing, axle nut and hangar Axle nuts - the 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 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! Specification: Material: iron Washer Inner Dia. :8mm Ring: 8mm Package Includes: 4 Pieces Nuts 8 Pieces Washers 4 Pieces Spacers