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 5mm inner diameter, 16mm outer diameter and 5mm thickness. These are great for small hobby 5mm shaft/rod projects. There comes total 10 pieces miniature bearings which you may use for many different projects. Specification: Model: F625ZZ Inner Diameter: 5mm / 0.2in Outer Diameter: 16mm / 0.6in Thickness: 5mm / 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: 60g / 2.1oz (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 5mm inner diameter, 16mm outer diameter and 5mm thickness. 4These are great for small hobby 5mm shaft/rod projects. 5There comes total 10 pieces miniature bearings which you may use for many different projects.