1、It has strong interchangeability, supports the interchangeability of guide sliders, high accuracy and small error. 2、The rail adopts DB back-to-back configuration, the slider moves smoothly, and the operation is simple and convenient. 3、Both ends are equipped with thickened dust-proof pads, which can effectively prevent dust from entering and have a long service life. 4、This linear slide rail is applied to many machines that need precise linear motion, such as automation equipment and precise measuring equipment. 5、Made of high hardness cast iron, it is durable, wear-resistant and corrosion-resistant. 2 x Linear Guide Rail with 4 Slide Block1 x Bag of Installation Accessories Condition: 100% Brand 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. 40x 1.5x 1.5cm / 15.7x 0.6x 0.6in Slide Block: Approx. 6x 3.5x 2.5cm / 2.4x 1.4x 1.0in