Self-drilling screw, architectural assembly for wide spread steel house, are able to drill and tap through steel up to 12 mm thickness. We have all other standard and non-standard fasteners in a wide range of length and diameter. Ferrous & non-ferrous carbon steel and stainless steel screws can be supplied with zinc or organic protective anti-corrosion finishes (Magni coating). Especially, this Delta coating, a higher level than zinc, are capable of standing at least 1,000 hours in salt-spray test.Blind rivet is for getting two pieces of thin iron plates together.All kind of automobile screw of Renault Samsung's SM5, SM3 has been producing since 1997