Sure-Grip Washer Frog 8-pack

Tension washer from Sure-grip with locking function. The washer is curved, which means that the washer tightens/locks against the nut when it is tightened. This prevents the nut from loosening itself. The washer has an 8 mm hole and fits most side by side roller skates on the market. There are 8 pcs. in the package.