Philips Flat Head Tek Screw a) Material: Carbon/Stailess Steel b) Dia: ... Len:9.5 - 180mm Self Drilling ScrewSelf Drilling Screws, also known as Tek screws, eliminate the need for a pre-drilled hole ... Thread CodeAB Type, A TypeHead CodeHex Head, Pan Head, Flat Head, Wafer Head, Truss Head, Pan Frame HeadDrive CodePhillips, Pozi, SlottedFinishPlain, Zinc Plated, Black/Grey Phosphated, Nickel, Brass etc ...