Features Bearings have a 5mm inner diameter, a 16mm outer diameter, and a 5mm thickness. They are rubber sealed to avoid contaminants entering and save lubricant. These bearings are made of high quality steel for low noise and long service life. These are great for small hobby 5mm shaft/rod projects. There comes total 20 pieces miniature bearings which you may use for many different projects. 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 5mm inner diameter, a 16mm outer diameter, and a 5mm thickness. These are great for small hobby 5mm shaft/rod projects. There comes total 20 pieces miniature bearings which you may use for many different projects. Specification: Model: 625RS Material: Bearing steel Type: Deep-groove high-speed Rolling Element: Single row Inner Diameter: 5mm / 0.2in Outer Diameter: 16mm / 0.6in Thickness: 5mm / 0.2in Quantity: 20pcs Weight: 105g / 3.7oz(approx.) Package list: 20 * Bearings Package List