Rail is extruded from high-grade 6061-T6 aluminum and hardcoat-anodized for a hard, long-lasting surface. Predrilled with holes for mounting fasteners. Choose low-beam rail if it will be supported for the entire length. Rails can be bent to suit a variety of applications. Minor bends often can be made when the rail is installed. If the rail requires more bend, Harken Industrial can provide horizontal, vertical, or compound curves to specification. 4" mounting hole spacing.