... 2.Material: steel 3.Diameter:4.2mm Truss Head Phil Self-Drilling Screw1) Standard: DIN, ANSI, ISO, GB2) Material: Carbon Steel3) Diameter ... : 13-75mm5) Slot: phil6) Head: truss7) Thread: UNC, UNF8) Point: self-drilling9) Finish: plain, zinc, black phosphated, grey phosphated,galvanized, ni ... delivery time, Reasonable price,The best service" Truss Head Phil Self-Drilling Screw