[10PCS 16.669mm]

-Features:
-Product Name: Steel Ball
-Material: 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

-Note: The ball of this material is not waterproof or rust-proof!
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.