This is your basic Shackle with a tiny difference. It has a .125" (1/8") offset. When you combine 2 you get a .25" (1/4") offset so you can change your Leaf springs with having to change your Shackle Hangers. Think of a Toyota running Chevy springs, the Toy spring width is 2.75" and the GM is 2.5" and this is a very common swap (Always doublecheck the bushing width, many are wide). They, like all of our Shackles are made of .375" (3/8") A50 Plate Steel and have a .75" hole for reinforcement if you desire. They are sold each.