Item Type: Long Linear Motion Bearing_x000D_ Material: Bearing Steel_x000D_ Model: LM12LUU_x000D_ Inner Diameter: Approx.12mm/0.5in_x000D_ Outer Diameter: Approx.21mm/0.8in_x000D_ Length: Approx.57mm/2.2in 1Great Replacement Parts: The set contains 2 piece linear motion bearing for you to use, can directly replace old or broken ones. 2Excellent Bearing Steel Material: The bearing adopts excellent bearing steel material, heat treatment processed, has high rigidity. 3High Performance: This linear motion bearing can move smoothly with low friction, providing precise linear motion. 4Standard Size: The bearings are manufactured by professional craftsmanship, with standard size, easy to install. 5Wide Application: The long linear motion bearing can be widely used in 3D printers, various of CNC machines.2 x_x000D_ _x000D_ LongLinearMotionBearing