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 a 8mm inner diameter, a 16mm outer diameter, a 5mm thickness and a 18mm flange. These are great for 8mm shaft/rod projects such as mechanical equipment, electrical instruments, toys, doors and windows. There comes total 10 pieces miniature bearings which you may use for many different projects. Description:Miniature flanged ball bearings are available ball bearings of small size. These miniature ball bearings have a 8mm inner diameter, a 16mm outer diameter, a 5mm thickness and a 18mm flange. Ball bearings of this size are ideal for precision work and applications that require a lot of functional mechanical parts, such as mechanical equipment, electrical instruments, toys, doors and windows. Specifications:Material: Bearing steelInner Diameter: 8mm / 0.31" Outer Diameter: 16mm / 0.63"Thickness: 5mm / 0.19"Flange Diameter: 18mm / 0.7"Quantity: 10pcs Package Includes:10 x Bearings Package List