Forgefix TechFast Composite Roof Panel to Timber Hex Screws with 16mm EPDM washers are used to join composite roof panels to timber frame buildings The specially designed compression control thread prevents damage and denting of panels No pre-drilling required the self-drilling T17 gash point on screws allows for a rapid installation The screws are fire and corrosion resistant protected by Elementech corrosion resistant coating salt spray tested to 1000 hours Complies with EU Safety Health and Environmental requirements They are supplied with 16mm EPDM rubber washers