This is a heavy-duty pivot hinge set, is satin stamped stainless steel, used on Phenolic and Solid Plastic restroom dividers. The hinges are designed for 3/4 inch to 1 inch thick doors and 3/4 inch 1 inch thick pilaster posts. They use this style of hinge due to the incredible strength they have, for the heavy solid plastic doors. Also known as a bathroom stall roller-bearing hinge set. Fasteners are included.