... BallCategoryStainless Steel BallMaterialAISI420Size2.0 mmGradeG500Hardness ( HRC)HRC58-65ApplicationBicycle, bearing, pulley, slide, handcraft, shelf, luggage, hardware, grinding mediaStandardGB/T-308-2002, GB ... originalShandong province, ChinaDeliveryWithin 30 days or confirmed while placing order Large quantity fast delivery steel ball with competive price