... and good 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 Steel2)Cage Material: Brass, ... 6301, 6302, 6303, 6304, 6305, 6306, 6307. 6308, 6309, 6310;6400 Series:6403, 6404,6405,6406,6407,6498,6409,6410 ...