Wafer Head self drilling screw 1. Standard: DIN, ANSI, GB 2 ... 9 to ST6.3 3. Material: Carbon Steel,st Wafer Head self drilling screw1. Standard: DIN, ANSI, GB 2. ... .surface:Plain,Zinc,Black,H.D.G.4.head: Hex, Pan or CSK5.packing:general export packing poly bag cartons ... ,then pallets6.delivery time:30days after order confirmation Wafer Head self ...