... from China; Certification:ISO14001:2004 ISO9001:2008 Specifications Drywall screw Process Capablilities Standard ISO, GB, DIN, JIS, ANSI, BSW, ASMEGrade ... .8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 etc.Size M0.8~M12Material Stainless, Steel,Brass, Steel ... commitment to excellence, our company makes a good performance in screw industry and develops well with the support of all customers ...