Feature: 1. It supports the exchange of sliders, with high accuracy, small error and smooth movement of sliders. 2. Both ends are equipped with thickened dust-proof pads, which can effectively prevent dust from entering and have a longer service life. 3. It is made of high hardness cast iron, which is wear-resistant and has good durability and stability. 4. It can be used in automation equipment, precision measuring equipment and many other machines that need precise linear motion. 5. Professional linear guide sliders, precision casting, thick materials, exquisite workmanship, easy to operate. Specification: Condition: 100% Brand New Item Type: Linear Guide Rail Material: Cast Iron Slide Block Color: Black Load Direction: Radial Thrust Bearing Mechanism: Hydrostatic Bearing Lubricant: Oil Lubrication Oil Lubrication Method: Drip Lubrication Lubrication Status: Boundary Lubrication Properties: High Speed Weight: Approx. 1805g / 63.7oz Size: Linear Guide Rail: Approx. 30x1.5x1.5cm / 11.8x0.6x0.6in Slide Block: Approx. 6x3.5x2.5cm / 2.4x1.4x1.0in . Package List: 2 Linear Guide Rail with 4 Slide Block1 x Bag of Installation Accessories Note: 1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.