General description Brand new and high-quality miniature deep groove steel ball bearings, designed for various applications. These bearings are impregnated with grease for smooth operation. Technical specifications Material: Steel Outer diameter: 22 mm Inner diameter: 8 mm Thickness: 7 mm Quantity: 50 pieces per pack Other information Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product. The measurement allowed error is +/- 1-3 cm.