Description Features: 100% brand new and high quality Made of high quality bearing steel for low noise and long service life. 3D printer CNC parts linear bearings set are double sealed to avoid contaminants entering and save lubricant, replace the damaged ball bearings in your devices to improve efficiency and save energy Linear motion bearing provides safe and reliable for the bearing sleeve and the bearing house assembly, much smoother and quieter than plastic bushings. Ball in the cage loop to run a smooth ball guide surface even if in high-speed operation, low noise These are great for small 6mm/8mm/10mm/12mm/16mm shaft rod projects such as 3D printer, engraving machine. Package Includes: 1 x Linear Ball Bearing Specifications: Condition: Brand New Model: SC6UU/ SC8UU/SC10UU/SC12UU/SC16UU Shaft ID: 6mm/8mm/10mm/12mm/16mm Quantity: 1 pc Material: Metal Main Application : working with Linear Rails Type Size: approx (Optional) LM6UU 3x1.8cm/1.18x0.71in LM8UU 3.4x2.2cm/1.33x0.87in LM10UU 4x2.6cm/1.257x1.02in LM12UU 4.2x2.8cm/1.65x1.1in LM16UU 5x3.85cm/1.97x1.5in Used for: 3D Printers, Engraving Machines, Other Machinery Industries. note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.