Mud flaps are made from 3/8 inch belting and are 18.5 inch wide by 12.5 inch high on each side. They are mounted on 1inch hollow steel bar that is 77.5 overall in length. It has eye bolt hangers on inside edge of each flap to make it easy to attach behind and under-neath the bumper. This protects trailer from mud and rocks. They were on a 2012 toyota tundra, and worked well for me.