Rock Slide Engineering Rocker Guard Plates provide side impact protection on the rocker panel and below the door frames. The Rocker Guards are attached with the included nutserts to the sheet metal of your Jeep below the door frames. They are crafted from 090 aluminum and finished with a durable textured black powder coating for corrosion resistance. Rock Slide Engineering designed these Rocker Guards for the Wrangler JL 4 Door to provide coverage and protection from trail debris and possible side impact below the doors of your Jeep. Installation is easy and they are Made in the USA.