All of our single shackles are made from 3/8" thick Laser Cut plate steel. We offer all our shackles in three different lengths to better suit your application. Shackles are measured from the center of bolt hole to center of bolt hole. All bolt holes are 1/2" and can be easily drilled to a larger size if needed. These shackles are sold individually. Like all of our products, they are made in the USA from USA steel.