This 8-piece set is engineered for a seamless drop-in replacement for Unicel FS-2004, Pleatco PFS2448, Filbur FC-9540, Hayward Pro-Grid DE4820 (DEX4800DA), MicroClear DE4800, and MicroClear SS DE4800 filters. The package includes 7 full grids and 1 partial grid (24"x11" and 24"x9.75"), ensuring a complete fit and restoring your filter to peak performance. They will fit and function perfectly in your 24-inch tall filter tank.