We are pleased to supply high thread self-drilling screws for steel rails and purlins, as well as self-tapping screws for timber. The most effective way to fix composite panels and cladding sheets through insulation, we can supply various lengths from 66mm to 150mm. Hex head or plastic head, with 16, 19 or 29 mm dia bonded washer, also available in heavy drill screws capable of drilling through 10 mm thk steel.