Item Type: T8 Lead Screw Kit_x000D_Optical Axes Length: Approx. 350mm / 13.78in_x000D_Material: Steel_x000D_Screw Length: Approx. 350mm / 13.78in_x000D_Material: Aluminium_x000D_Flexible Coupling Size: Approx. 20 x 25mm / 0.79 x 0.98in_x000D_Material: Aluminium Alloy_x000D_Guide Shaft Support Size: Approx. 40 x 33 x 14mm / 1.57 x 1.3 x 0.55in_x000D_Material: Aluminium_x000D_Slider Size: Approx. 33 x 30 x 21mm / 1.3 x 1.18 x 0.83in_x000D_Material: Aluminium 1Various Parts: The 3D printer kit includes optical axes and lead screw, housing bearing, linear guide, CNC step couplers and ball bearing. 2Bearing Block: Comes with good bearing capacity, the bearing block can be installed with strong adaptability, stable and reliable to use. 3Reliable Work: Ensuring high accuracy, the T8 lead screw kit will surely improve your working efficiency and enables better safety as well. 4Practical Use: Can be widely applied in machinery industry, electronic equipments, guide rods, transmission shafts, 3D printing and so on. 5Good Material: Combining high quality steel and aluminium materials, which is rustproof and very durable with wearing and long term using. 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