久久久久久国产一区二区三区,天天狠天天操,国产乱码久久久久久一区二区,黄色短视频免费观看,日日噜噜夜夜爽狠狠视频 ,午夜激情啪啪,不卡的av电影在线

Main Products
Products Grade: SWRCH10K,SWRCH15K
Specifications: Φ5.5~Φ28mm
Applied Standard:  Q/XG114
Characteristics: The product is used to produce screw.
Applications: Common partsCommon fastenerconstruction fastener steel
Use of Products: SWRCH10K,SWRCH15K is used to produce screw. It is also can be used to produce fastener of grade 4.8 to 6.8 and non-standard parts. The product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, good surface quality, high accuracy of geometric dimensions, low rate of cracking.