<h3>Key features</h3><ul> <li>Precision 12mm Inner Diameter: LM12UU linear ball bearing with 12mm ID, 20mm OD, and 30mm height, designed to fit 12mm rods perfectly for smooth linear motion.</li> <li>Durable Bearing Steel Construction: Made of high-quality chrome steel for low noise, reduced vibration, and extended service life under heavy use.</li> <li>Double Sealed Design: Both sides are rubber-sealed to and debris ingress while retaining lubrication, ensuring consistent performance.</li> <li>Versatile Application: Ideal for CNC routers, 3D printers, engraving machines, and other DIY linear motion projects requiring reliable slide bushings.</li> <li>Value 10-Pack: Includes 10 pieces of LM12UU bearings, providing ample quantity for multiple assemblies or replacement needs.</li> </ul><p>Free shipping on orders $50+. 30-day hassle-free returns.</p>