... quality 4,The materials are bearing steel Specificationsdeep groove ball bearing manufacturer in Shandong. Certification:ISO9001:2008 Faster Delivery ... Steady Quality Deep groove ball bearing1)Material: Gcr15, Bearing Steel, Carbon Steel, Chrome ... 696, 697, 698, 699, 6900, 6901, 6902, 6903, 6904, 6905, 6906, 6907. 6908, 6909, 6910;6000 Series:605, 606, 607, ...