... drilling screw / roof screw 1. Standards1. din75042. Material2. Stainless steel(SS304,SS316), carbon steel(C1022,1010,1008) copper, iron and so ... construction industry, furniture fields and other public equipment 1.various kinds of hex self drilling screw available.2.this hex self ... 3.material of our hex self drilling screw:stainless steel ,carbon steel,copper and so on4.surface treatment of this hex ...