Features 1、These bearings are made of high quality steel for low noise and long service life. 2、They are rubber sealed to avoid contaminants entering and save lubricant. 3、Bearings have a 8mm inner diameter, a 19mm outer diameter, and a 6mm thickness. 4、These are great for small hobby 8mm shaft/rod projects. 5、There comes total 20 pieces miniature bearings which you may use for many different projects. Specification Features: These bearings are made of high quality steel for low noise and long service life. They are rubber sealed to avoid contaminants entering and save lubricant. Bearings have a 8mm inner diameter, a 19mm outer diameter, and a 6mm thickness. These are great for small hobby 8mm shaft/rod projects. There comes total 20 pieces miniature bearings which you may use for many different projects. Specification: Model: 698RS Material: Bearing steel Type: Deep-groove high-speed Rolling Element: Single row Inner Diameter: 8mm / 0.3in Outer Diameter: 19mm / 0.7in Thickness: 6mm / 0.2in Quantity: 20pcs Weight: 145g / 5.1oz(approx.) Package list: 20 * Bearings Package List