Description: <br>Miniature flanged ball bearings are available ball bearings of quite small size. These miniature ball bearings have a 4mm inner diameter, a 9mm outer diameter, a 4mm thickness and a 10.3mm flange. 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 4mm inner diameter, a 9mm outer diameter, a 4mm thickness and a 10.3mm flange. <br>These are great for small hobby 4mm 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: 4mm / 0.15" <br> <br>Outer Diameter: 9mm / 0.35" <br>Thickness: 4mm / 0.15" <br>Flange Diameter: 10.3mm / 0.4" <br> <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 4mm inner diameter, a 9mm outer diameter, a 4mm thickness and a 10.3mm flange <br>4、These are great for small hobby 4mm 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