Fastener specification:M3 ,M4 ,M5, M6, M8 ,M10 ,M12, inch: 1/ ... ,5/32 3/16,5/16. material: steel, stainless steel... Fastener we use cold forged technique, not only save materials,good ... ,5/32 3/16,5/16. material: steel, stainless steel, brass,aluminium. Surface treat: white zinc (CR+3), yellow Zinc(CR ...