A cast iron gully grid, also known as a gully grate, is used to cover drainage gullies and prevent debris, leaves, and other foreign objects from entering the drainage system. This heavy-duty drain cover is made of thick cast iron and features a black satin finish. It is designed for square gullies and measures 5" x 5" (127mm x 127mm) with a 9mm thickness. Product type: PLUMBING FIXTURE. Manufacturer: THOMAS DUDLEY.