Tapping Screw Size: #0-#18 Material: AISI 1022, zinc Certificate: ISO9001, ISO14001. Quality control: 100% inspection. ROHS complaint SUS304 Hexgonal Socket Cylinder Head Self Tapping Screws1.Material: Carbon Steel of grade4.8, grade 6.8, SUS201, SUS303, SUS302, SUS304,SUS316 and etc.2.Finish:black oxide,zinc plated(white zinc, black zinc, colour zinc, blue zinc), plain finish, chromated and etc. ...