A4 self-tapping screws with DIN 7982 countersunk head are made of A4 acid-resistant stainless steel. Self-tapping screws with a countersunk head have a conical shape that allows the screw to be sunk into the surface so that it sits flush with the material it is fastened to. The screw is typically used in applications requiring secure and reliable fastening of materials, especially in woodwork. They are well suited for use in wood construction, furniture production, interior installations and similar applications.