ForgeFix TechFast Metal Roofing Panels to Timber Hex Screws are designed to join metal roofing panels to timber frame buildings. They feature a specially designed compression control thread to prevent damage and denting of panels, eliminating the need for pre-drilling. The self-drilling T17 Gash Point ensures rapid installation. These screws are fire and corrosion resistant, protected by Elementech corrosion resistant coating and have undergone salt spray testing to 1000 hours, complying with EU Safety, Health and Environmental requirements. They are supplied with 16mm EPDM rubber washers. Specifications: Size: 6.3 x 32mm, Steel Thickness: 0.5-1.2mm, Head Type: 8mm Hex, Pack Size: 100.