Features Complete Accessories: 3D printer T8 lead screw kit is complete, including optical shaft and lead screw, housing bearing, linear guide rail, CNC step coupler and ball bearing, which is easy to use. Bearing Seat: the bearing seat is made of high-quality materials, with precision workmanship, good bearing capacity and adaptability, simple installation, stable and reliable use. Good Reliability: this T8 lead screw kit is made by professional technology, with good precision, which can effectively improve your work efficiency and use reliability. Wide Application: this T8 fixed lead screw mounting bearing kit is widely used in the mechanical industry, electronic equipment, guide rod, transmission shaft, 3D printing, etc. Advanced Material: This linear motion rod shaft guide rail and T8 lead screw kit are made of high-quality steel and aluminum, with good corrosion resistance and wear resistance, and long service life. Specification: Item Type: T8 Lead Screw Kit Optical Axes Length: Approx. 350mm / 13.78in Material: Steel Screw Length: Approx. 350mm / 13.78in Material: Aluminium Flexible Coupling Size: Approx. 20 x 25mm / 0.79 x 0.98in Material: Aluminium Alloy Guide Shaft Support Size: Approx. 40 x 33 x 14mm / 1.57 x 1.3 x 0.55in Material: Aluminium Slider Size: Approx. 33 x 30 x 21mm / 1.3 x 1.18 x 0.83in Material: Aluminium Package List: 2 x Optical Axes 1 x Lead Screw 1 x T8 Lead Screw Nut 4 x Vertical Sliding Block 2 x Flexible Coupling 4 x SCS8UU Sliding Block 2 x Zinc Alloy Bearing Block Bearing KP08 Note: Please allow a small error of 1‑3mm in the 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 Coupling 4 x SCS8UU Sliding Block 2 x Zinc Alloy Bearing Block Bearing KP08