Widely used for digital 3D coordinate measuring equipment such as precision equipment or special machinery industrySuitable for kinds of electronic equipment/guide bar, drive shaft, and pillarBearing Pillow Block have a certain bearing capacity, can hold in ordinary precision rack, strong adaptability.Smooth moving, low friction, high rigidity and long working life.They are good abrasion , not easy to rust, high precision and good strength.Color: SilverMaterial: aluminum alloySpecifications of Steel Linear Shaft Optical Axis :Outer diameter: 8mm or 031inchLength: 200mm or 787inchSpecification of Linear Rail Support Guide Shaft Bearing :Product Size:42 x 32 x 11mm/165 x 126 x 043 inchInside Diameter:8mm/031 inch (Applicable to the optical axis diameter 8mm)Pacakge Size:45 x 35 x 30mm/177 x 138 x 118 inchSpecification of Linear Ball Bearing:Inner Diameter: 8mm/0315 inchLength: 345mm/136 inchPackage Contents:4 * Linear Motion Ball Bearing4 * Rail Support Guide2 * Linear Shaft Optical AxisOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.