... NN3011 High Precision Needle Roller Bearings,chrome and carbon steel bearing,chrome steel bearing, Guangzhou Xinbeilin Bearing Co., Ltd. ... NN3011 High Precision Needle Roller Bearings,chrome and carbon steel bearing,chrome steel bearing, Guangzhou Xinbeilin Bearing Co., Ltd. ... 4.Quality: ABEC-1, 3, 5, Z1V1 Z2V2 Z3V3, EMQ5.Material: Chrome steel, stainless steel,Carbon steel6.Quality standard: ISO9001 ...