Samac B90DS21 90mm Galv'd Drive Screws 2.5kg B90DS21 Commonly used for roofing and cladding applications Ideal for securing corrugated metal or plastic sheets to timber purlins Compatible with Sela caps and washers or Dowty washers for a watertight seal Designed to create a waterproof fixing at the roof entry point Drive screw design offers a permanent, tamper-resistant fixing Lacks a drive recess, making removal difficult once installed 90mm galvanised finish for corrosion resistance Pack weight: 2.5kg Brand: Samac The Samac B90DS21 90mm Galv'd Drive Screws are a reliable choice for professional roofing and cladding installations. Engineered for secure, long-lasting fixing, they are particularly well suited to corrugated sheet applications where strength, weather resistance, and a neat finish are essential. When used with compatible caps or washers, they help deliver a dependable watertight seal, making them a practical solution for demanding exterior projects.