草久久精品,成人久久亚洲,日本一道本在线视频,国产精品99一区二区,一区二区三区综合,久久精品5,自拍偷拍你懂的

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.