This single row deep groove ball bearing is widely used in electronic equipment, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, and other machinery and equipment. They feature 2 metal shields to protect the bearing from dust or possible contamination. These bearings are pre-lubricated with grease. Features: - Model: 624ZZ - Color: Silver Tone - Material: Durable metal - Inner Diameter: 4mm (0.16 inch), Outer Diameter: 13mm (0.51 inch) - Thickness: 5mm (0.2 inch) - Groove ball bearing suitable for 3D printers and other equipment - Equipped with 2 metal shields, one on each side, to protect against dust and contamination - Commonly used in electric motors, wheel bearings, agricultural machinery, conveying systems, and more Packing List: 10 x 624ZZ 4mm x 13mm x 5mm Single Row Shielded Deep Groove Ball Bearings