Description: <br>Miniature ball bearings are available ball bearings of quite small size. These miniature ball bearings have a 3mm inner diameter, a 8mm outer diameter, and a 4mm thickness. Ball bearings of this size are ideal for precision work and applications that require a lot of functional mechanical parts in a small space, such as 3D printer, quadcopter or model. <br> <br> <br>Features: <br>These miniature bearings are made of high quality bearing steel for low noise and long service life. <br>They are double shielded to avoid contaminants entering and save lubricant. <br>Bearings have a 3mm inner diameter, a 8mm outer diameter, and a 4mm thickness. <br>These are great for small hobby 3mm shaft/rod projects such as 3D printer, quadcopter or ship model. <br> <br>There comes total 10 pieces miniature bearings which you may use for many different projects. <br> <br> <br>Specifications: <br>Material: Bearing steel <br>Inner Diameter: 3mm / 0.12" <br> <br>Outer Diameter: 8mm / 0.31" <br>Thickness: 4mm / 0.15" <br>Quantity: 10pcs <br> <br> <br>Package Includes: <br>10 x Bearings<br>1、These miniature bearings are made of high quality bearing steel for low noise and long service life <br>2、They are double shielded to avoid contaminants entering and save lubricant <br>3、Bearings have a 3mm inner diameter, a 8mm outer diameter, and a 4mm thickness <br>4、These are great for small hobby 3mm shaft/rod projects such as 3D printer, quadcopter or ship model <br>5、There comes total 10 pieces miniature bearings which you may use for many different projects