Mild Steel Self Drilling Screw is special types of fasteners that are designed to be self-drilling and self-tapping, which means they have a drilling point at the tip of the screw. These screws are made of mild steel, which offers good strength and durability while also being cost-effective. One of the main advantages of these screws is that they can drill and tap their own holes, eliminating the need for pre-drilling. This saves time and effort, making them a popular choice for construction, roofing, and other projects where drilling and tapping is needed.