Widely used for digital 3D coordinate measuring equipment such as precision equipment or machinery industry Suitable for kinds of electronic equipment or guide bar, drive shaft, and pillar Pillow Block have a certain capacity, can hold in 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: Silver Material: aluminum alloy Specifications of Steel Linear Shaft Optical Axis : Outer diameter: 8mm or 0.31inch Length: 200mm or 7.87inch Specification of Linear Rail Support Guide Shaft : Product Size:42 x 32 x 11mm or 1.65 x 1.26 x 0.43 inch Inside Diameter:8mm or 0.31 inch (Applicable to the optical axis diameter 8mm) Pacakge Size:45 x 35 x 30mm or 1.77 x 1.38 x 1.18 inch Specification of Linear Ball : Inner Diameter: 8mm or 0.315 inch Length: 34.5mm or 1.36 inch Package Contents: 4 x Linear Motion Ball 4 x Rail Support Guide 2 x Linear Shaft Optical Axis Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.