... call them : one is Metric T-Grid System ,another is British T-Grid System ; For the Metric T-Grids System is widely used in India ,UAE ... African Countries,and some other countries ; For the British T-Grid System is widely used in Tai Wan Region,Bangladesh,Malaysia,The ... ,596mm*596mm ,595mm*1195mm,like this ; For the British T-Grids System,the size of ceiling board must be longer than 600mm ...