Features: _x000D_ and high quality._x000D_ _x000D_ These liner-motion bearings are made of high quality bearing steel for low noise and long service life. _x000D_ They are double sealed to avoid contaminants entering and save lubricant. _x000D_ Bearings have a 8mm inner diameter, a 15mm outer diameter, and a 24mm height. _x000D_ These are great for small hobby 8mm shaft/rod projects such as 3D printer, engraving machine. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Type: LM8UU _x000D_ Material: Bearing steel _x000D_ Inner Diameter: 8mm / 0.31inch _x000D_ Outer Diameter: 15mm / 0.59inch _x000D_ Height: 24mm / 0.94inch _x000D_ Quantity: 12pcs _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 12 x Linear Motion Bearing 1 and high quality 2These liner-motion bearings are made of high quality bearing steel for low noise and long service life 3They are double sealed to avoid contaminants entering and save lubricant 4Bearings have a 8mm inner diameter, a 15mm outer diameter, and a 24mm height 5These are great for small hobby 8mm shaft/rod projects such as 3D printer, engraving machine