Product Features Product Name: Steel Ball
Material: GCR15 bearing steel
Tolerance: ±0.01mm
Hardness: HRC60
Size (diameter): 15.081mm,15.5mm,15.875mm,16mm,16.5mm,16.669mm,17mm,17.463mm,17.5mm,18mm,18.256mm,18.5mm,19mm,19.05mm,19.5mm,19.844mm,20mm,20.5mm,20.638mm,21mm,21.431mm,22mm,22.225mm,22.5mm,22.8mm,23mm,23.5mm,23.813mm,24mm,24.5mm,24.606mm,25mm,25.2mm,25.3mm,25.4mm,25.5mm,26mm,26.2mm,26.5mm,27mm,27.5mm,28mm,28.57mm
28.575mm,29mm,29.2mm,29.3mm,29.5mm,29.6mm,30mm
1.high hardness, wear resistance, smooth surface, good roundness, not easy to rust
2.These ball bearings are precision engineered for perfect consistency of weight, dimensions and finish.Made from high grade steel, these balls can withstand tremendous amounts of impact force.