Widely used for digital 3D coordinate measuring equipment such as precision equipment or machinery industrySuitable for kinds of electronic equipment/guide bar, drive shaft, and pillar Pillow Block have a certain capacity, can hold in ordinary precision rack, strong adaptability. moving, low friction, high rigidity and long working life.They are good abrasion resistance, not easy to rust, high precision and good strength.Color: SilverMaterial: aluminum alloySpecifications of Steel Linear Shaft Optical Axis :Outer diameter: 8mm or 0.31inchLength: 200mm or 7.87inchSpecification of Linear Rail Support Guide Shaft :Product Size:42 x 32 x 11mm/1.65 x 1.26 x 0.43 inchInside Diameter:8mm/0.31 inch (Applicable to the optical axis diameter 8mm)Pacakge Size:45 x 35 x 30mm/1.77 x 1.38 x 1.18 inchSpecification of Linear Ball :Inner Diameter: 8mm/0.315 inchLength: 34.5mm/1.36 inchPackage Contents:4 * Linear Motion Ball 4 * 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.