Features: 1It has strong interchangeability supports the interchangeability of guide sliders high accuracy and small error. 2The rail adopts DB back-to-back configuration the slider moves smoothly and the operation is simple and convenient. 3Both ends are equipped with thickened dust-proof pads which can effectively prevent dust from entering and have a long service life. 4This linear slide rail is applied to many machines that need precise linear motion such as automation equipment and precise measuring equipment. 5Made of high hardness cast iron it is durable wear-resistant and corrosion-resistant. Specification: Condition: 100% NewItem Type: Guide RailMaterial: Cast IronSlider Color: BlackLoad Direction: Radial ThrustBearing Mechanism: Hydrostatic BearingLubricant: Oil LubricationOil Lubrication Method: Drip LubricationLubrication Status: Boundary LubricationUsage Properties: High SpeedWeight: Approx. 2115g / 74.6ozSize:Linear Guide Rail: Approx. 40x1.5x1.5cm / 15.7x0.6x0.6inSlide Block: Approx. 6x3.5x2.5cm / 2.4x1.4x1.0in Package List: 2 x 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.