What is the weight of one of these?

Thank you for your question!

The weight of the 1500x1000mm Flat Glass Roof Light is 74.4kg.

When handling this product, we kindly ask that you follow all relevant health and safety guidelines. Ensure you have the proper tools and equipment, and enlist the help of additional personnel if needed due to its weight. Always wear appropriate protective gear, such as safety gloves and sturdy footwear, and be mindful of your surroundings.