Designed for superior performance, our self-drilling screws with bonded washers are perfect for installing sheet-metal on beams, both light and heavy. Ideal for both indoor and outdoor applications, these screws are crafted from hardened carbon steel and come with a bright zinc plated or C4 class Silver CorrSeal surface treatment.   Key Features: Material: C1022 Carbon Steel Head Shape: Hexagon Surface Treatment: Zinc Plated Corrosion Resistance: Class C1 Approvals: CE, ETA Application Environment: Indoors/Outdoors Technical Notes: Ensure screws are not overtightened to prevent damage to the sealing washer. Use a screwdriver with an adjustable depth stop for efficient installation. Recommended Speed: 1800-2500 RPM For more information or to place an order, contact us anytime on WhatsApp: +852 68409292 or email: felixyung@ddfasteners.com. Elevate your fastening solutions with DD Fasteners today!