Widely used for digital 3D coordinate measuring equipment such as precision equipment or special machinery industry Suitable for various types of electronic equipment, guide bar, drive shaft, and pillar Bearing Pillow Block has a certain bearing capacity, can fit in ordinary precision rack, strong adaptability Smooth movement, low friction, high rigidity, and long working life 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 Specifications of Linear Rail Support Guide Shaft Bearing: Product Size: 42 x 32 x 11mm / 1.65 x 1.26 x 0.43 inch Inside Diameter: 8mm / 0.31 inch (Applicable to optical axis diameter 8mm) Package Size: 45 x 35 x 30mm / 1.77 x 1.38 x 1.18 inch Specifications of Linear Ball Bearing: Inner Diameter: 8mm / 0.315 inch Length: 34.5mm / 1.36 inch Package Contents: 4 x Linear Motion Ball Bearing 4 x Rail Support Guide 2 x Linear Shaft Optical Axis Only the above package content, other products are not included Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm