Features 1、100% Brand new and high quality 2、These liner-motion bearings are made of high quality bearing steel for low noise and long service life 3、They are double sealed to avoid contaminants entering and save lubricant 4、Bearings have a 8mm inner diameter, a 15mm outer diameter, and a 24mm height 5、These are great for small hobby 8mm shaft/rod projects such as 3D printer, engraving machine Specification Features: 100% Brand new and high quality. These liner-motion bearings are made of high quality bearing steel for low noise and long service life. They are double sealed to avoid contaminants entering and save lubricant. Bearings have a 8mm inner diameter, a 15mm outer diameter, and a 24mm height. These are great for small hobby 8mm shaft/rod projects such as 3D printer, engraving machine. Specifications: Type: LM8UU Material: Bearing steel Inner Diameter: 8mm / 0.31inch Outer Diameter: 15mm / 0.59inch Height: 24mm / 0.94inch Quantity: 12pcs Package Includes: 12 x Linear Motion Bearing Package List