Specification Brand : GUWANJI BulletPoint1 : Package includes: 4PCS MGN9H 400mm/15.75inch Linear rail guide, 4PCS MGN9H block. BulletPoint2 : High quality materials: Made of Bearing Steel , move smoothly without deflection high accuracy minimal wear and low noise. Professional and technical steel rails and blocks for low-friction bearings, long-lasting and long-lasting. BulletPoint3 : Advantages: Easy to disassemble and install. Durable, corrosion resistance and smooth, perfectly fits most 3D Printer. And it works beautifully for both slider motion as well as panning. BulletPoint4 : Wide applications: Used in devices for the manufacture of semiconductors, printed circuit boards, IC packages, medical devices, robot arms, precision encoders and other small linear motion devices. BulletPoint5 : Friendly services: If you have any questions about our products, please do not hesitate to contact us, we will provide you the best solution within 24 hours. Color : As Shown ExteriorFinish : Brass ExternallyAssignedProductIdentifier : 9430183025513 ExternallyAssignedProductIdentifier1 : 0733371690456 ExternallyAssignedProductIdentifier2 : 733371690456 ItemName : GUWANJI MGN9 400mm Linear Guide Rail, Linear Sliding Guideway 4pcs Rails + 4pcs MGN9H Linear Bearing Sliding Carriage Block for 3D Printer and CNC Machine ItemPackageDimensions_Height : 4 centimeters ItemPackageDimensions_Length : 40 centimeters ItemPackageDimensions_Width : 2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : linear-motion-guides Manufacturer : GUWANJI Material : Alloy Steel MetalType : Brass ModelNumber : 3035D71561396X NumberOfItems : 4 NumberOfPieces : 1 PartNumber : 3035D71561396X ProductDescription : Packing list: 4 x 400mm MGN9 linear rail 4 x MGN9H carriage block