Specification Brand : Befenybay BulletPoint1 : 【Material】The linear rails are made of carbon steel and surface chrome plating treatment, beautiful anti-rust, high hardness, the linear Bearings made of quality bearing steel with aluminum alloy housing BulletPoint2 : 【Easy to Install】Aluminum alloy support rail with pre-drilled holes for ease of mounting BulletPoint3 : 【Function】Cylindrical guide composed by principal rail and aluminum support, stabilizing the original rail, premier quality bearing blocks moves smoothly while using BulletPoint4 : 【Widely Used】The linear guide rail is widely used for the automation machinery such as DIY CNC routers, lathes, machine tools, bending machines, laser welding machines BulletPoint5 : 【Package】2pcs SBR12-400mm linear slide rail, 4pcs SBR12UU bearing block, 2pcs handles ExternallyAssignedProductIdentifier1 : 191170846670 ExternallyAssignedProductIdentifier2 : 0191170846670 ItemName : Befenybay 2PCS Black SBR12-400mm Linear Slide Rail and 4PCS SBR12UU Square Type Carriage Bearing Block for Automated Machines and CNC Equipments ItemPackageDimensions_Height : 41.91 centimeters ItemPackageDimensions_Length : 4.3942 centimeters ItemPackageDimensions_Width : 10.2108 centimeters ItemTypeKeyword : linear-motion-guides Manufacturer : Befenybay Material : Metal ModelNumber : BE092-2-fba NumberOfItems : 1 PartNumber : BE092-2-fba ProductDescription : Perfect combination of main axle and aluminum alloy support, which nicely stabilizes the original rail Style: Linear slide rail set Performance: Smooth motion, Low noise Rail Shafts: 2pcs SBR12 Bearing Blocks: 4pcs SBR12UU Rail shaft length: 400mm/15.7inch Rail shaft diameter: 12mm/0.47inch Main Color: Black Package Content: 2pcs SBR12-400mm linear slide rail 4pcs SBR12UU bearing block 2pcs handles