Features: 1It supports the exchange of sliders with high accuracy small error and smooth movement of sliders. 2Both ends are equipped with thickened dust-proof pads which can effectively prevent dust from entering and have a longer service life. 3It is made of high hardness cast iron which is wear-resistant and has good durability and stability. 4It can be used in automation equipment precision measuring equipment and many other machines that need precise linear motion. 5Professional linear guide sliders precision casting thick materials exquisite workmanship easy to operate. Specification: Condition: 100% Brand NewItem Type: Linear Guide RailMaterial: Cast IronSlide Block Color: BlackLoad Direction: Radial ThrustBearing Mechanism: Hydrostatic BearingLubricant: Oil LubricationOil Lubrication Method: Drip LubricationLubrication Status: Boundary LubricationProperties: High SpeedWeight: Approx. 1805g / 63.7ozSize: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.