Item Type: Linear Ball Bearings Model: LM40UU Material: Bearing Steel Width: Approx. 80mm/3.1in Outer Diameter: Approx. 60mm/2.4in Inner Diameter: Approx. 40mm/1.6in Package List 2 x Linear Ball Bearing 1Steel Material: Made of advanced bearing steel, and after special heat treatment, the advanced manufacturing equipment and technology greatly increase the service life of the bearings. It can save costs for equipment with high requirements and difficult to disassemble. 2High Speed: High bearing accuracy, fast running speed, low friction torsion, good rotation. The bearings runs with low noise. 3Main Application: This linear ball bearings'main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. 4Wide Application: The linear ball bearings is widely used in EPE equipment, agricultural machinery, robots, robotic arms, construction machinery, manipulators, accuracy instruments, factory equipment, engraving machines, 3D printers, textile machinery, automation equipment, etc. 5Specification: This linear ball bearing has a 80mm width, 60mm outer diameter, 40mm inner diameter. Provide you with an accurate choice.