Pack of 100 steel self-drilling large head sheet metal screws - head recess: PH/Phillips Dimensions: Head diameter: 11mm. Height of the screw /with the head/: 21mm Self-drilling screw with rounded head: Ø4.2x19mm. To quickly penetrate metal without pre-drilling Fully threaded screw - self-drilling for very quick and easy assembly Use: For metal-to-metal fixings - metal frame, aluminum profiles. Self-drilling screws are designed in cases where it is important to distribute pressure over larger/oversized holes Application: Steel construction, carpentry work, interior fittings, fixing sheet metal, metal siding, for tightening gutters, for mounting grilles, sheet metal roofing, etc. Self-drilling pan/pan head screw - rust resistant Unit weight: 1.71 g. Finishing material: Steel-Zinc Plated. Colour: Silver