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7mm Chrome Bearing Steel Ball for Ball Bearing/Auto/Motorcycle /Bicycle Parts/ Guide Rail. Wide Size Range: Available sizes from 0.45mm to 50mm to meet diverse application needs. Multiple Material Options: Offering Stainless Steel, Carbon Steel, and Chrome Steel balls in various grades. OEM Service Available: Customized OEM services provided for specific client requirements. International Certifications: Certified with ISO 9001 and IATF16949 for quality assurance. Free Sample Policy: Free samples are provided for quality evaluation before bulk orders. Strict Quality Control: Rigorous inspection on size, hardness, and surface clarity for every ball.