standard:4.8 , 6.8 , 8.8, C1008,45#,SUS304,SUS316
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standard:DIN 938 A2-50, A2-50, A4-50, A4-70
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standard:DIN939 A2-50, A2-50, A4-50, A4-70
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standard:A2-50, A2-50, A4-50, A4-70
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standard:A2-50, A2-50, A4-50, A4-70
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