Profile: T F S (Derby) Ltd. specializes in offering bi-metal stainless & carbon steel drill screws, sealants & roofing and cladding related products. Self drilling/self tapping screws include countersunk head wing drillscrew, hexagon head stitching screws, self tapping screws AB point, self drilling screws for light sections & heavy sections, self drilling screws for composite panel light section, hexagon head timber screws, timber screws for composite panels & sheets and hexagon head fibre cement screws.