三级中文字幕,www.日韩操,国产亚洲精品美女久久久,97 人人操操人人

Main Products
Products Grade: B7
Specifications: φ5.5-38mm
Applied Standard:  agreement
Characteristics: Cold Forging Steel
Applications: High strength fastenerCommon parts
Use of Products: This grade has the feature of stable chemical composition, low harmful elements, minor decarburization, good surface quality,homogeneous properties along the coil, good plasticity and ductility.