This Seismic Expansion Joint Cover features a high load bearing system ideal for vehicular traffic areas, such as parking garages and warehouses. This Heavy Duty System is fully engineered for both pneumatic and solid tires. Simple, rugged design makes this system a cost-effective option. GCS Series features a cover plate of AA-6061 - T 651 (Special Hard Aluminum Alloy). This system is specially designed to accommodate sub-floors of variable heights.