Machined from a solid plate of certified, US-sourced 6061-T6 aluminum, our Sacrificial Rock Ring™ is available in 1/2" or 3/4" thicknesses and offer protection to ward off damage from trail abuse. Features include twelve counterbored holes designed to protect the fasteners as well as our unique 3/8" wide interlocking flange with a precision counter-bore that engages perfectly with the machined underside of the Sacrificial Rock Ring™ by means of six mounting points. Much like the fit of a manhole cover, these rings seat snugly into the wheel and fortify the outer lip. We designed them to be easily removed in a matter of seconds. The voids visible between fasteners allow water a path to escape, which helps prevent imbalanced conditions in cold climates.