Feature: 1. WIDE RANGE OF APPLICATIONS: Linear optical axes with rod guide, digital coordinate measuring equipment bracket is widely used in digital 3D coordinate measuring equipment such as accurate equipment or special machinery industry 2. SCREW GUIDES: Screws are widely used in machine tools such as 3D printing, and optical shafts are suitable for various electronic equipment, guide rods, transmission shafts, pillars 3. GOOD BEARING SEAT: The bearing seat has a certain bearing capacity, can be installed on the ordinary accuracy rack, and has strong adaptability 4. GOOD QUALITY ALUMINUM MATERIAL: Made of good quality aluminum, has good wear resistance, not easy to rust, high accuracy and good strength 5. PRACTICAL 3D PRINTER PARTS: The kit includes optical shafts and leadscrews, housing bearings, linear guide brackets, CNC stepper couplers and ball bearings Specification: Item Type: Lead Screw Set Optical Axes Length: Approx. 500mm / 19.69in Optical Axes Material: Steel Screw Rod Length: Approx. 500mm / 19.69in Screw Rod Material: Aluminum Flexible Coupling Size: Approx. 20 x 25mm / 0.79 x 0.98in Flexible Coupling Material: Aluminum alloy Guide Shaft Support Size: Approx. 40 x 33 x 14mm / 1.57 x 1.3 x 0.55in Guide Shaft Support Material: Aluminum Slider Size: Approx. 33 x 30 x 21mm / 1.3 x 1.18 x 0.83in Slider Material: Aluminum. Package List: 2 x Optical Axes1 x Lead Screw1 x T8 Screw Nut4 x SK8 Vertical Sliders2 x Flexible Couplings4 x SCS8UU Slider2 x Zinc Alloy Housing Bearing KP08