Municipal castings Grade ASurface boxes capable of withstanding vehicle wheel loads as defined in BS5834 of up to 5 tonnes. Use: Suitable for use in carriageways carrying fast-moving traffic or continuous heavy traffic.SolutionsWarrior Grade AFast and efficient access to emergency and below ground servicesDouble Triangular Grade AFor use on chambers where a larger access is requiredSolid Top Grade AStability and durability in use