This hinge is designed for 1" or larger steel frame gates, and the post can be 1 1/2" 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.