The following are required to build this product:
This spacer will fit onto an 8mm axle, it has a 12mm outer diameter & is 10.3mm Long in length. Its job is to fit between the bearings of longboard wheels to support the load through the bearing centre, its strongest point.
The Carbon Steel Longboard wheel Spacer is .3mm oversized to allow for shrinkage gained from natural usage over time which ultimately prevents ratttle & maintains best performance to the user for as long as possible. From time to time it is good practice for you to exchange your spacers to ensure maximum performance at all times.