DeMello Off-Roads double square tube sliders are built with 2"x2" sqaure .120 wall tubing. We use 4 supports to attach them to your Tundra frame. DeMello Off-Road also uses 3"x5" L-shape brackets to mount your sliders to your frame. Don't be fooled by cheaper imatations of rocker panel protection! These are fully welded fully gusseted weld on sliders.