Material: Aluminum . Finish: Powder coating,standard colour RAL9016 or RAL9010. Other finish are available. EG-F Eggcrate Grille lattice size 12.7* 12.7 * 12.7. Inner Frame is removable without the use of the tools. EG-Fi Eggcrate GrilleInclined 45 degree lattice size 12.7* 12.7 * 12.7 Inner Frame is removable without the use of the tools.