Detailed Product Description Series6000, series6200, series6300, series6400, series6700, series6800, series6900. Metric minature series, Inch minature series, Thrust roller series, Flange series, HK series needle roller series, HFone way needle roller series. Pricision Level:0(ABECI), 6(ABEC3), 5(ABEC5), 4(EBEC7), 2(EBEC9)Tolerance grade:GB/T307.1-205Steel pressed cage: bending claw form or rivet ...