Below is a list of Drain Grates manufacturers from Detroit, Michigan. Drain grates are an essential component of drainage systems that allow the passage of fluids through a pipe or drain while capturing debris which may clog or otherwise damage piping. Grates are a framework of metal or fiber reinforced plastic bars, sheets and meshes which create a porous grid. Also known as drain strainers, filters and screens, these particular grates are used in a variety of industrial, commercial and residential applications.