... 5*11mm 3.competitive price Galvanized Self tapping screw Pan framing head self tapping screw/DIN7981 Material: C1022 Diameter: 2.5mm,3 ... .5mm........ Length: 13mm, 16mm,19mm,25 mm, 32mm,41mm,51mm Specification: Round truss head ... , Sharp self-tapping screwCoating:Zinc,Yellow Zinc,black,grey ...