These rock sliders are Heavy duty off-road protection for the H3 Hummer rocker panels (the area right below the doors). They allow you to bounce your Hummer off rocks, trees, and what ever happens to get stuck under there without worrying about damaging anything on your H3. Built to take a beating, the square tubing is quarter inch thick, the mounts are half inch thick, the circle tubing is standard DOM roll cage tubing .2 inches thick and they weight in at 84lb. each. Basically, you’ll never worry about crushing you rocker panels again.