Construction screws and self-tapping screws are fasteners with a drilling or thread-cutting point that do not require pre-drilling or tapping. Roofing screws: with EPDM washer (seals the hole), hex head or hex washer head, painted in RAL color. For corrugated sheets and metal roofing. For wood: sharp point, coarse thread, for frame house construction. For metal: drill point (TEK), fine thread. For drywall: phosphated, Phillips cross recess. Material: carbon steel C1018/C1022, hardened. Coating: zinc, phosphate, polymer paint (RAL). Sizes: 3.5–6.3 mm × 19–200 mm. Packaging: boxes of 200–1000 pcs. EPDM washer seals the hole from rain and snow. EPDM washer service life 25+ years. Head coating: powder coating, RAL color to match roofing (3005, 6005, 8017 — popular). For wooden battens: sharp point. For metal purlins: drill point (TEK). Packaging: boxes of 250 pcs with bit included.