... High Hardness 3. OEM service accepted 4. Low noise &wear resistance 5. Fast delivery ADVANTAGE OF ... in several industries, such as hardware, sliders, ball bearing lead screw, wheels, toys, bicycles, bearings, trust ... Steel BallCategoryStainless Steel BallMaterialAISI440Size2.0 mmGradeG500Hardness ( HRC)HRC58-65ApplicationBicycle, bearing, pulley, slide, handcraft, shelf, luggage, hardware, grinding ...