Item Type: Linear Ball Bearing Slide Block Model: SCS8UU Inner Bore Diameter: Approx. 8mm / 0.3in Material: Aluminum Alloy, Steel Package List 4 x Slide Block 1SPECIFICATIONS: SCS8UU linear ball bearing slide block, bearing model is LMF8UU, shaft nominal bore diameter is 8mm, with standard processing. 2ALUMINUM ALLOY: The slide block is made of aluminum alloy, which is light in weight and corrosion resistant, not easy to wear after long term use. 3BALL BEARING: Lightweight housing and chrome steel bearing balls, which has good wear resistance, with high accuracy and strength. 4GOOD PERFORMANCE: The linear motion rail slide block features smooth operation, has high rigidity, low friction and long service life. 5MULTIPLE USAGES: Suitable for all kinds of guide rods and columns, used in electrical appliances, electric motors, construction machinery and auto parts.