Features 1、Cooperate Use: The use of sprocket and chain is a fast, efficient and simple method to transfer motion from one shaft to another, while keeping the rotation direction of the two shafts in the same direction. 2、Basic Specifications: Multiple holes with a grid distance of 8mm and a diameter of 4mm, in the middle there is a hole with a diameter of 14mm that can hold a bearing, and there are 4 diameters that exist at an angle of 45° to the bearing hole near the bearing hole. 3、Application: This is an aluminum sprocket suitable for use as transmission parts for robots, machinery and equipment. 4、Aluminum Material: High quality gear is made of aluminum material, with good corrosion resistance and heat resistance. 5、Not Easy to Wear: This is a gear that is not easy to wear and break, and can be used for a long time. Specification Item Type: Sprocket Gear Material: Aluminum Surface Treatment: Anodic Oxidation Treatment Pitch: Approx. 8mm / 0.31in Center Aperture: Approx. 14mm / 0.55in Threaded Hole Model: Approx. M4x0.7mm / 0.03in Package List 2 x Gear