General description Hex head self-drilling screws designed for joining roofing sheets to light section steel (maximum thickness of 5.0mm) without the need for pre-drilling. These screws come with an EPDM washer for enhanced sealing and durability in exterior applications. Technical specifications Type: Self-drilling screws Head type: Hex head Size: 5.5 x 50 mm Maximum steel thickness: 5.0 mm