Item Type: Linear Motion Ball Bearing Slide Block_x000D_ Model: SBR30UU, SBR35UU (Optional)_x000D_ Material: Aluminum Alloy_x000D_ SBR30UU: Length: 70mm/2.76in, Width: 70mm/2.76in, Height: 55mm/2.17in, Inner Diameter: 30mm/1.18in_x000D_ SBR35UU: Length: 80mm/3.15in, Width: 80mm/3.15in, Height: 60mm/2.36in, Inner Diameter: 35mm/1.38in_x000D_ Lubricant: Oil Lubrication_x000D_ Lubrication Method: Drip Lubrication 1Surface oxidation treatment, beautiful and corrosion resistant. 2High density aluminum alloy structure makes the slide block strong load bearing. 3Low friction and smooth movement makes it save energy. 4Easy to install, high precision, fast speed. 5Suitable for high speed mute high precision equipment, construction machinery, transmission device.1 x Linear Motion Ball Bearing Slide Block