Versatile Application: Functions as servo arms for controlled motion and crank connecting rods, featuring side holes for screw fastening in different mechanical configurations Attractive Rose Gold Finish: The elegant rose gold coating improves visual appeal while maintaining the durability of these finely crafted aluminum servo components Robust Aluminum Construction: Crafted from sturdy aluminum alloy, these gold servo arms offers reinforced build and prolonged functionality for transmission requirements in multiple applications tight Engineering: Designed with 3.1mm, 4.1mm, and 5.1mm bore sizes to firmly accommodate 3mm, 4mm, and 5mm shafts, ensuring stable attachment for various motor types and steering output shafts Comprehensive 3 Size Package: Includes all three standard sizes (3mm / 4mm / 5mm compatible) for versatile use across projects and machinery demands, Manufacturer: Asukohu