A diagonal brace in a ringlock scaffold system provides lateral support and stability to the scaffold structure. It typically consists of a diagonal metal tube or rod that connects two vertical members (standards) at an angle, usually 45 degrees. This diagonal bracing helps to distribute loads more evenly across the scaffold and prevents sway or deformation, especially in taller or more complex scaffold configurations. The design of the diagonal brace ensures that the scaffold remains structurally sound and safe for workers to use at various heights and in different environments.