Features: These miniature bearings are made of high quality bearing steel for low noise and long service life. They are double shielded to avoid contaminants entering and save lubricant. Bearings have 8mm inner diameter, 19mm outer diameter and 6mm thickness. These are great for small hobby 8mm shaft/rod projects. There comes total 10 pieces miniature bearings which you may use for many different projects. Specification: Model: F698ZZ Inner Diameter: 8mm / 0.3in Outer Diameter: 19mm / 0.7in Thickness: 6mm / 0.2in Property: High speed Application: Universal Rolling Element: Single row balls Race Type: Deep groove race Material: Bearing steel Angle: 15 degree Sealing: Double-shielded Weight: 90g / 3.2oz (approx.) Package list: 10 * Bearings Package List 1These miniature bearings are made of high quality bearing steel for low noise and long service life. 2They are double shielded to avoid contaminants entering and save lubricant. 3Bearings have 8mm inner diameter, 19mm outer diameter and 6mm thickness. 4These are great for small hobby 8mm shaft/rod projects. 5There comes total 10 pieces miniature bearings which you may use for many different projects.