Features Optical Axes: Linear axes and optical axes with rod guide Digital coordinate measuring equipment bracket is widely used for digital coordinate measuring equipment such as equipment or special machinery industry, optical axes is suitable for various elect Shaft Block: The shaft block has a certain load capacity and can be mounted on a common accuracy rack, which is highly adaptable and perfect for long term use. High Quality Aluminum: These are made of high quality aluminum, good wear resistance, not easy to rust, good strength. Screw Guide: The screw guide is widely used in 3D printing and other machine tools, and you can get more efficiency by reasonable operation according to your actual use. Practical Parts: The kit includes optical axes and screws, housing bearings, linear guide brackets, CNC step couplers and ball bearings that you can replace just in time when you need them. Specification: Item Type: T8 Lead Screw Kit Length of Optical Axes: Approx. 300mm / 11.8in Material: Steel Length of Screw: Approx. 300mm / 11.8in Material: Aluminum Flexible Coupling Size: Approx. 20 x 25mm/ 0.8 x 1.0in Material: Aluminum Alloy Guide Shaft Support Size: Approx. 40 x 33 x 14mm / 1.6 x 1.3 x 0.6in Material: Aluminum Slider Size: Approx. 33 x 30 x 21mm / 1.3 x 1.2 x 0.8in Material: Aluminum Package List: 2 x Optical Axes 1 x Lead Screw 1 x T8 Screw Nut 4 x Vertical Slider 2 x Flexible Coupling 4 x SCS8UU Slider 2 x Zinc Alloy Housing Bearing KP08 Note: Due to manual measurement, please allow 1‑3 mm error. Thank you for your understanding. Package List 2 x Optical Axes 1 x Lead Screw 1 x T8 Screw Nut 4 x Vertical Slider 2 x Flexible Coupling 4 x SCS8UU Slider 2 x Zinc Alloy Housing Bearing KP08