Specification Brand : YDuupxe BulletPoint1 : Great Replacement Parts: The set contains 2 piece linear motion bearing for you to use, can directly replace old or broken ones BulletPoint2 : Excellent Bearing Steel Material: The bearing adopts excellent bearing steel material, heat treatment processed, has high rigidity BulletPoint3 : High Performance: This linear motion bearing can move smoothly with low friction, providing precise linear motion BulletPoint4 : Standard Size: The bearings are manufactured by professional craftsmanship, with standard size, easy to install BulletPoint5 : Wide Application: The long linear motion bearing can be widely used in 3D printers, various of CNC machines Color : Silver ExternallyAssignedProductIdentifier : 9164910397085 IncludedComponents : bearing ItemDisplayDimensions_Height : 0.63 centimeters ItemDisplayDimensions_Length : 1.18 centimeters ItemDisplayDimensions_Width : 0.63 centimeters ItemDisplayWeight : 0.01 pounds ItemName : 4Pcs Long Linear Motion Bearing Bearing Steel Linear Ball Bearing with Low Friction for 3D Printers CNC Machines ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 8 centimeters ItemPackageDimensions_Width : 7 centimeters ItemTypeKeyword : linear-ball-bearings Manufacturer : YDuupxe Material : Alloy Steel ModelName : Bearing ModelNumber : YDuupxe4z6egf7py5 NumberOfItems : 1 NumberOfLithiumMetalCells : 1 PartNumber : YDuupxe4z6egf7py5 ProductDescription : Specification: Item Type: Long Linear Motion Bearing Material: Bearing Steel Model: LM12LUU Inner Diameter: Approx.12mm/0.5in Outer Diameter: Approx.21mm/0.8in Length: Approx.57mm/2.2in