This hinge is designed for 1" or larger steel frame gates, and the post can be 1" or larger. The post and gate brackets are Mild steel all the other parts are stainless steel. Shipped with self drilling screws. Hinges are made with bearings and a removable clevis pin. Swings 180 degrees. Comes with springs on each hinge for fast and easy closing of the gate. Each set comes with 2 hinges to hang a gate.