Features Great Replacement Parts: This set includes 2 pieces of long linear motion bearings, providing a direct replacement for old or broken ones, ensuring seamless maintenance. Excellent Bearing Steel Material: Crafted from high-quality bearing steel material, heat-treated for enhanced rigidity, ensuring durability and longevity of the bearings. High Performance: These steel linear motion bearings deliver smooth movement with low friction, ensuring linear motion, enhancing the overall performance of the equipment. Standard Size: Manufactured with professional craftsmanship, these linear ball bearings come in a standard size, enabling easy and hassle- installation. Wide Application: Suitable for a wide range of applications including 3D printers and various CNC machines, making them versatile and adaptable for different needs. Features: 1、Great Replacement Parts: The set contains 2 piece linear motion bearing for you to use, can directly replace old or broken ones. 2、Excellent Bearing Steel Material: The bearing adopts excellent bearing steel material, heat treatment processed, has high rigidity. 3、High Performance: This linear motion bearing can move smoothly with low friction, providing linear motion. 4、Standard Size: The bearings are manufactured by professional craftsmanship, with standard size, easy to install. 5、Wide Application: The long linear motion bearing can be widely used in 3D printers, various of CNC machines. Specification: Item Type: Long Linear Motion Bearing Material: Bearing Steel Model: LM12LUU Inner Diameter: Approx.12mm/0.5in Outer Diameter: Approx.21mm/0.8in Length: Approx.57mm/2.2in Package List: 2 x Long Linear Motion Bearing Package List 2 x Long Linear Motion Bearing