亚洲色图欧美色,久久不射电影,欧美激情手机在线,好看的一级毛片,亚洲狼人区,天天爱天天做天天爽,91欧美日韩

Main Products
Products Grade: 42CrMoA
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.