Self drilling roofing screw with EPDM washer 1. specialize in stainless steel fields 2. compelete ... , phillips flat head, phillips oval head, hex head with washer, hex head with flangeDrill type: Fastning the 1-6mm thickness steel plate, fastening ... : Surface passivation treatmentStandard: GB/T15856Test: Drill drive test, ductility testAny type of self drilling screw is available for us, also supply ...