... ,6400series material:bearing steel,GCR15 hardness:59-63HRC 16001 2rs low noise deep groove ball bearing detail description:1) Types: 60 series ... , (Din) 100Cr6 -Germany, carbon steel, iron. 4) Shield / Closure: Plain (Open), Z, ZZ, RS, 2RS, 2ZR, 2Z. 5) Vibration and Noisy ... : KMY, We also have ability to produce your own brand or other famous brand (SKF, NSK, HCH, KG, KOYO brand, etc ...