Feature: 1. Adopt double-sided dust-proof rubber sealing to prevent foreign matter from entering and prolong service life 2. Adopt nylon retainer, low motion inertia, low starting torsion, less noise and smoother operation 3. High-tech polished surface with high smoothness and high brightness 4. Suitable for industrial automation, aerospace, machine tools, engraving machines, robots and automobiles 5. The linear bearings are frictional and relatively stable, do not change with the speed of the bearing, and can obtain smooth linear motion with high sensitivity and high accuracy. 6. Adopt bearing steel material, durable to use. 7. Outer ring and steel ball are made of bearing steel material, strengthened by heat treatment, increasing life and load 8. Compact structure, easy to install, ordinary linear bearings can be installed in any direction, using the shaft as a support for precise work, and the mounting surface is easy to machine Specification: Item Type: Linear-Motion BearingMaterial: Bearing steel Optional Style: LM10LUU, LM12LUU, LM13LUU LM10LUU: Inner Diameter: Approx. 10mm / 0.4in Diameter: Approx. 19mm / 0.7in Thickness: Approx. 54mm / 2.1in LM12LUU: Inner Diameter: Approx. 12mm / 0.5in Diameter: Approx. 21mm / 0.8in Thickness: Approx. 57mm / 2.2in LM13LUU: Inner Diameter: Approx. 13mm / 0.5in Diameter: Approx. 23mm / 0.9in Thickness: Approx. 60mm / 2.4in. Package List: 1 x Linear-Motion Bearing