General description Pack of 200 self-drilling sheet metal screws with a large domed head, designed for rapid penetration into metal without pre-drilling. These screws are fully threaded and made from zinc-plated steel, ensuring rust resistance and durability. Ideal for various applications including metal-to-metal fixings, steel construction, and carpentry work. Technical specifications Material: Zinc-plated steel Drive System: PH/Crosshead Head Style: Round Head, Truss Dimensions: Ø4.2x25mm Head Diameter: 11mm Screw Height (with head): 21mm Unit weight: 1.85 g Color: Silver Usage Metal-to-metal fixings Steel construction Carpentry work Interior design Sheet metal fastening Metal cladding Tightening gutters Mounting grilles Sheet metal roofing