... assurance The main products DIN7504 - DIN7504 - N, K, DIN7504 - P series: hex head, flat, round head, huawei head, big flat head ... And from "made in Taiwan, high quality SUS304 / SUS410 series stainless steel drlling screw, nicolas bibcock, dacro drlling screw, etc ... can according to customer special requirement of special specifications of self-drilling screw. 10.9 level large hex high strength steel ...