Feature: 1. Use high quality aluminum alloy material, durable, high strength, and have a long service life. 2. The clamping collar adopts a method of fixing the screw without damage in the axial direction of the thread. 3. The hole is precise and can be matched with an 8mm / 0.3in lead screw to form the largest contact area, achieve the smallest error. 4. The clamping collar has a wide range of uses, and can be applied to robots, engineering equipment, etc. 5. It can be used to replace old or damaged old parts, and can be replaced independently, and you can experience the fun of maintenance. Specification: Item Type: Clamping Collar Material: Aluminum Alloy Model: 5504-0804-2109 Center Hole Size: Approx. 8mm / 0.3in Screw: M4 x 0.7mm / 0.03in Compatible: For Robots, Engineering Equipment, Etc. . Package List: 5 x Clamping Collar Note: Please match the appropriate design size before installation and use.