Black Galvanized Torx Self Drilling Screws a) Material:Carbon Steel b) Dia: #6-# ... known as Tek screws, eliminate the need for a pre-drilled hole and allow drilling and fastening to ... ResistantFrom basic zinc coating to 3000 hours SST, a variety of coating options available to fit your environment ... 14)Length6.5 -150mm (1/4''-6'')Thread CodeAB Type, A TypeHead CodeHex Head, Pan Head, Flat Head, Wafer ...