Features: Engineered for accuracy and durability, the RDS3218 20KG double Shaft Digital Servo delivers 21.5 kg cm stall moment with full metal gears, IP66 waterproofing, and 180°/270° rotation for high performances robotics and applications. Featuring a robust aluminum alloy housing, double bearing systems, and wide operating electric (4.8 6.8V), this servo thrives in extreme temperatures ( 30°C to 80°C storage) while maintaining 0.16s/60° speed at 5V. Designed for robotics enthusiasts, industrial automation engineers, and drones builders requiring stable , heavy duty actuation in demanding projects. Ideal for robotic arms, automated production lines, competition grade vehicle, and outdoor robotics where IP66 defense combats dust/moisture. The double shaft design with standardized interfaces enables seamless integration with /Raspberry systems, while optimized gears reduce operational noise by 50% for accuracy motion control. Specifications: Component : metal Size: about 6.4x5.56x2cm/2.5x2.2x0.8inch Attribute: 180 degrees Package Includes: 1 set Digital Servo note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.