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Material Alloy Steel Drive System Cross Head, Phillips Head Style Round Head Type Truss Thread Coverage Fully Threaded Size Ø4.2x25mm About this item Pack of 200 self-drilling large head steel sheet metal screws - Head Recess: PH/Crosshead Dimensions: Head Diameter: 11mm. Screw Height /with head/: 21mm Self-drilling screw with truss head: Ø4.2x25mm. For rapid penetration into metal without pre-drilling Fully threaded screw - self-drilling for very quick and easy assembly Use: For metal-to-metal fixings - metal framing, aluminum profiles. Self-drilling screws are designed for situations where it is important to distribute pressure over larger/oversized holes. Application: Steel construction, carpentry work, interior design, sheet metal fastening, metal cladding, for tightening gutters, for mounting grilles, sheet metal roofing, etc. Self-drilling screw with cylindrical/panel head - rust resistant. Unit weight: 1.85 g. Finishing material: Steel-Zinc plated. Color: Silver