Cast iron manhole cover.
Material and Standards: It's made of cast iron and adheres to the BS-497/76 standard, indicating compliance with British Standards for cast iron fittings.
Dimensions: The "600X450" marking likely indicates its dimensions, possibly 600mm by 450mm, which is a common size for access covers.
Applications: Cast iron manhole covers are known for their strength and durability, making them suitable for various applications, including high-traffic areas like roads and city streets.
Load Bearing Capacity: Different classes of cast iron manhole covers exist, with varying load-bearing capacities, ranging from light pedestrian areas to heavy-duty applications like docks and airports.