These Spring Plates are built to withstand the most rugged off road abuse. They have a built-on skid plate to protect U-Bolts. The top plate is 5/16" steel and the bottom (skid plate) is stamped out of 1/4" steel. These Heavy Duty Universal Spring Plates are designed to be used with 2 1/2" wide springs and come with bolt on, replaceable shock mounts. Price listed is for a pair of plates.