国内精品久久久久久久日韩,成人国产视频在线观看,亚洲精品国产一区二区,少妇一级淫片免费放在线,视色av,国产精品美女久久久av,蜜桃av网站

Main Products
Products Grade: Q235NH、G295NH、XG295NH
Specifications: 5.5-38mm
Applied Standard:  GB/T4172 or agreement
Characteristics: Mainly used to produce fasteners of class 4.8-6.8
Applications: Common fastener
Use of Products: These product have characteristics of uniform chemical composition, low percentage of harmful elements, high purity, tight tolerance, good surface quality. The products can be used without heat treatment and surface treatment, and will be excellent weather-resistant performance.