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A CSK head self-drilling screw features a unique head design that tapers down to meet the surface of the material being fastened. This countersunk design allows the screw to sit flush with or below the surface, providing a clean finish. The self-drilling capability stems from a drill-like point, which allows the screw to create its hole as it is driven into the material. These screws are typically made from high-strength steel or stainless steel, making them suitable for various applications.

Tek screws are also known for their versatility. They can be used to fasten a wide range of materials, including metal, wood, and plastic. This makes them a popular choice for a variety of applications, from roofing and decking to automotive and HVAC systems.