Ultraline ceiling grids, also called as slotted tee grid consist of main tee,cross tee and wall angle, all components of system are made of high quality galvanized steel material. Slotted ceiling grids are available in British & Metric size, like main tee 3.0m, 3.6m in Metric length or 3.05m, 3.66m in British length as customers' requested.