This design is a solution for the open area underneath your "Polaris Rock Slider Nerf Bar" as well as the area along the outside of the nerf. It gives coverage from the round tube on the nerf all the way down and inward to the main frame skid. The skid is CNC cut and formed for a precise fit. Installation requires inserting two self-drilling stainless steel fasteners (included) into your nerf bar. We offer three options for side skids. Please view our selction of side skids before checking out.