... quality with reasonable price 4.complete specifications ZWZ chrome steel brass cage bearing angular contact ball bearing Advantages: 1. Low ... more convenient for them to preload.Retainer are made of brass,synthetic resins or others which subect to individual bearing ... series,71800 series,71900- seriesID size5 mm - 1350 mmCage materialSteel , brass , Iron , plasticPrecision P0,P6,P5, P4(ABEC- 1,ABEC- ...