Install the cross tees 1200 mm 28mm x 15mm perpendicular between the main runners to form a 1200 x 600 mm grid. For 600x600 mm grid, install cross tees 600 mm at 600 mm PRODUCT QUANTITIES REQUIRED FOR M2 CONSTRUCTION Cross Tee 1200 1.67 Im Cross Tee 600 0.84 Im Physical Data Material - Hot dipped galvanized steel Surface Finish - Baked polyester paint Cross Tee / Main Tee Interface - Stepped ends Profile - Exposed tee system System Characteristics Exposed 15 mm system Fast and simple to install Maximum economy and design simplicity Cross-tees with override-ends resist twisting and give professionally finished look with no exposed steel edges Compatible with most lay-in ceiling tiles.