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Expanding metal wall anchors are designed to hold heavy items by distributing the load across a larger area within the wall. They typically consist of a metal sleeve that expands when a screw is driven into it. This expansion action grips the surrounding material, creating a solid anchor point that can support significant weight. They are particularly useful in scenarios where traditional screws might loosen over time, such as in drywall installation or when hanging items from concrete surfaces.

When using countersunk self-drilling screws for steel, it is important to follow the manufacturer's guidelines for proper installation. This includes selecting the correct screw size and length for the application, as well as ensuring that the drill point is sharp and in good condition. Taking these precautions will help ensure a successful and secure fastening job.