Features Professional Kit: This kit comes with optical axes, lead screw, lead screw nut, sliding block, vertical sliding block, flexible coupling, pillow block bearing to you for usage. Fine Workmanship: The pillow block bearing has a certain bearing capacity and can be installed on ordinary precise racks, has strong adaptability. Scope of Application: The optical axes is suitable for guide rods, transmission shafts and pillars of various electronic equipment, and the screw rod can be widely used in machine tools such as 3D printing. Premium Metal Material: The screw, guide shaft support and sliding block are made of high quality aluminum, with good wear resistance, not easy to rust, high precise and good strength. Wide Application: This kit is widely used in digital 3D coordinate measuring equipment such as precise equipment or special machinery industry. Specification: Item Type: Lead Screw Set Optical Axes Material: Steel Screw Rod Material: Aluminum Flexible Shaft Coupling Material: Aluminum alloy Guide Shaft Support Material: Aluminum Sliding Block Material: Aluminum Optical Axes Length: Approx. 400mm/15.7in Screw Rod Length: Approx. 400mm/15.7in Flexible Shaft Coupling Size: Approx. 20x25mm/0.8x1in Guide Shaft Support Size: Approx. 40x33x14mm/1.6x1.3x0.6in Sliding Block Size: Approx. 33x30x21mm/1.3x1.2x0.8in Package List: 2 x Optical Axes 1 x Lead Screw 1 x T8 Lead Screw Nut 4 x Vertical Sliding Block 2 x Flexible Shaft Coupling 4 x Sliding Block 2 x Zinc Alloy Pillow Block Bearing Note: Please allow 1‑3mm error due to manual measurement. Thanks for your understanding. Package List 2 x Optical Axes 1 x Lead Screw 1 x T8 Lead Screw Nut 4 x Vertical Sliding Block 2 x Flexible Shaft Coupling 4 x Sliding Block 2 x Zinc Alloy Pillow Block Bearing