Forgefix Tfcl5550 Techfast Roofing Screw TimberSteel Light Section 5.5 X 50mm Pack 100 Fortfcl5550 from B&Q

Forgefix

Used for joining Timber to steel frame buildings No.3 drill tip for self-drilling light gauge steel up to 5mm Screw fitted with breakaway wings that create a clearance hole to protect thread from engaging timber when drilling through Breakaway wings will ream a hole then break-off when they contact the metal surface to be drilled Torx compatible insert for a higher transmission of power, Weight: 1.32 Pounds, Manufacturer: ForgeFix