Item Type: Radial Ball Bearing Material: High Carbon Chromium Bearing Steel Uses: Widely used for gearboxes, instrumentation, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, engineering machinery, roller skates, yo yos, etc. Parameter Specifications: Model Inner Diameter, Outer Diameter, Thickness(Approx.) 130010mm / 0.40in, 35mm / 1.38in, 11mm / 0.43in 130112mm / 0.47in, 37mm / 1.46in, 12mm / 0.47in 130215mm / 0.59in, 42mm / 1.65in, 13mm / 0.51in 130317mm / 0.67in, 47mm / 1.85in, 14mm / 0.55in Package List 6 x Bearing Please pay attention to match the corresponding size before use 1Advanced Technology: Using advanced technology, the bearing surface is glazed and flat , waterproof and dust prevention, not easy to rust, and long service life 2High Carbon Chromium Bearing Steel: High hardness, good wear resistance and contact fatigue strength, the core maintains good toughness, and can carry high impact loads 3Minimal Friction Resistance: High speed operation, rotating with minimal friction resistance, so as to obtain high accuracy and flat motion 4Application: Suitable for gearboxes, instrumentation, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, etc. 5Mute Effect: Well made, working in coordination with the machine, greatly improving the operating efficiency of the machine, and bearing noise is smaller