Features 1.Optical axis is suitable for all kinds of electronic equipment / guide rods, drive shafts, pillars. 2.Screw rods are widely used in machine tools, such as 3D printing. 3.The bearing housing has a certain bearing capacity and can be mounted on an ordinary precision rack with strong adaptability. 4.The kit includes optical axis and lead screw, housing bearing, linear guide support, CNC stepper coupler and ball bearing. 5.Flexible shaft coupling. Specification Features: Optical axis is suitable for all kinds of electronic equipment / guide rods, drive shafts, pillars. Screw rods are widely used in machine tools, such as 3D printing. The bearing housing has a certain bearing capacity and can be mounted on an ordinary precision rack with strong adaptability. The kit includes optical axis and lead screw, housing bearing, linear guide support, CNC stepper coupler and ball bearing. Flexible shaft coupling. Specification: Optical Axis: Size: Approx. 20.2 cm/ 7.9 in Material: Steel Flexible Shaft Coupling: Size: Approx. 2 * 2.5 cm/ 0.8 * 1.0 in Material: Aluminum Alloy Guide Shaft Support: Size: Approx. 4 * 3.3 * 1.4 cm/ 1.6 * 1.3 * 0.6 in Material: Aluminum Sliding Block: Size: Approx. 3.3 * 3 * 2.1 cm/ 1.3 * 1.2 * 0.8 in Material: Aluminum Screw Rod: Size: Approx. 20 cm/ 7.9 in Material: Aluminum Package list: 2 * Optical Axis 1 * Screw Rod 1 * For T8 Nut 4 * Sliding Block 2 * Coupling 4 * Guide Shaft Support 2 * Zinc Alloy Bearing Block Bearing Package List