Product Description: Advantages: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Made of steel, sturdy and durable, smooth movement, low friction, high rigidity and long life.4.The size of each part of the bearing is standardized and interchangeable, so there is no need to worry about replacement and wear.5.Linear bearings are widely used in electronic equipment, food machinery, packaging machinery, medical machinery, printing machinery, and other precision equipment or special machinery industries. Specifications:Material: SteelColor: SilverModel: SC16UULength: 5cm/1.97inchSize: 5x4.4x3.8cm/1.97x1.73x1.5inch(LxWxH)Weight: 738g Package include:4 x Linear Ball Bearing