... Needle roller bearingHK, BK seriesHK, RS HK, 2RS seriesBK, RS seriesNA, RNA, NK seriesHF, FC SeriesHFL, FCB seriesK series, KZK, KBK seriesAXK ... and etc.1. Model: LZ series, HK SERIES, BK SERIES, HK-RS SERIES, BK-RS SERIES, FFH SERIES, MFH SERIES, FY SERIES, MFY SERIES, HF SERIES, HFL SERIES etc2. Materials: GCr15, GCr15SiMn, G20Cr2Ni4A ...