Secure exterior metal with DIN 7504 K hex washer head self-drilling Tek screws. Features 16 mm bonded EPDM washer for a watertight seal and allowance for thermal movement. Made from case-hardened steel with Zinc CR3 plating for lasting corrosion resistance. 5.5 mm diameter, compatible with 8 mm hex drive tools. Available in lengths 20, 35, and 50 mm for roofing, cladding, purlin fixing, and light-to-medium steel frames. No pilot holes needed--drill, fasten, and seal in one step.
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