Tapered Roller Bearing Detail: 1.material: bearing steel 2.Certificate:ISO9001:2000 3.delivery time : 7days 4.stablenonoise ... ,6200,6300,6400,51100,51200,51300, Inch and metric series etc.MaterialChrome Steel ,GCr15,Carbon steel,Stainless steelNoise standardZ1, Z2, Z3, Z4Quality ... us in time fanny lang 2012 hot sales ! super quality and high precision bearings ltd international certification