... D-21SIZE:M5-M20MATERAIL:STAINLESS OR STEELShanghai Qiangyi Fastener Co.,LTD is a professional fastener Manufacture here in Shanghai, China. Our ... Company focus on nuts, and specialize in weld nuts. At the moment, Our main products includes:Hexagon Weld Nuts; Square Weld ... ,;Flange Nuts, Nylon Insert Lock Nuts and so on. For the quality control,we can guarantee customer 25ppm,we got ...