... Gcr15-China, (AISI) 52100-USA, (DIN) ... 3).various of bearin Supply different kinds of good quality angular contact ball bearing,main features:1 ... cover: Z, ZZ, RS, 2RS, RZ, ZNR, etc.4. Vibration and Noisy level: Z1, Z2, Z3 ZV1.ZV2.ZV3, 5. Precision ... , tools, etc.7. Packing: individual box single plastic bag, cartons and wooden cases8. Production range: standard ...