Standard for Roll-Line Wheels, but usable on other brands.
For Quad Skates.
Set of 8 – Aluminum Spacers
7mm Axles – Standard quad Roll-Line plates
BEARING SPACERS 7MM or 8MM (SET OF 8) (For Quad Skates)
When the axle lock nut is tightened down on the wheel that has bearing spacers, it creates an axle size that is effectively increased from 7mm to approximately 11mm. The increasing of the axle size greatly reduces the possibility of bending or breaking any axle. By locking the bearings and spacer down, it also assures that the center race of each bearing is not spinning on the axle, but that the balls of the bearings are doing the actual work that they are intended to do. Tightening of the axle lock nut on a wheel without a spacer may compress the inner races towards the center of the wheel and cause misalignment.