Feature: 1. Suitable for silent high precision equipment, construction machinery, transmissions. 2. Made of high-strength aluminum alloy material, strong carrying capacity and long service life. 3. Surface oxidation treatment, beautiful and corrosion resistant. 4. Smooth movement, low friction, high rigidity and long life. 5. Easy to install and convenient to use. Specification: Condition: 100% Brand New Item Type: Linear Bearing Slide Block Material: Aluminum Alloy Model: SBR20UU Length: Approx. 50mm / 1.97in Width: Approx. 48mm / 1.89in Height: Approx. 38mm / 1.5in Inner Diameter: Approx. 20mm / 0.79in Lubricant : Oil Lubrication Oil Lubrication Method: Oil Drip Lubrication Package List: 2 x Linear Bearing Slide Block