1、This miniature bearing is made of high quality zirconia ceramic for low noise and long service life. 2、Ceramic bearing is impervious to corrosion and rarely require lubrication. 3、Bearing has a 8mm inner diameter, a 22mm outer diameter and a 7mm thickness. 4、It is great for 8mm shaft/rod projects such as mechanical equipment,electrical instrument, toy, door and window. 5、The bearing is used in a wide variety of applications including, electric motors, home appliances, toys and much more. Features: This miniature bearing is made of high quality zirconia ceramic for low noise and long service life. Ceramic bearing is impervious to corrosion and rarely require lubrication. Bearing has a 8mm inner diameter, a 22mm outer diameter and a 7mm thickness. It is great for 8mm shaft/rod projects such as mechanical equipment,electrical instrument, toy, door and window. The bearing is used in a wide variety of applications including, electric motors, home appliances, toys and much more. Specification: Material: Zirconia ceramic Model: 608 Inner Diameter: 8mm / 0.31in Outer Diameter: 22mm / 0.87in Thickness: 7mm / 0.28in Quantity: 8pcs Weight: 96g / 3.4oz (approx.) Package list: 8 * Bearings