... Hex Head Self Drilling Screw Diameter: #6#14,3.5-6.3 Length:9.5-125mm,3/8-5 Material: C1022 Finish :zinc plated Hex Head Self Drilling Screw1 ... Finish: different kinds of finish available . such as: brighty,zinc plated. yellow zinc plated , hot-dip galvanized, mechanicalplated and black finished.4) Standards ... the industries, such as constructionand automobile industries. Hex Head Self Drilling Screw