Features: Performance: With anti blocking and anti burning protection function, with waterproof function. CNC precision gear, it is more wear-resistant and not easy to break and sweep teeth. Metal gear high torque for RC car, crawler and robot. Great choice for university professors and students who are interested in developing software for robot parts. If there are any problems, please contact our store in time. We will give you a satisfactory solution. Specifications: Item: 20kg Digital Servo Rotation Angle: 270 Degree Dead Band: 3sec Operating Voltage: 5.0V~6.8V Operating Speed (5V): 0.12sec / 60 at no load Operating Speed (6.8V): 0.09sec / 60 at no load Stall Torque (5V): 21 kg/cm Stall Torque (6.8V): 23.5 kg/cm Motor Type: Carban Brush Motor Gear Type: Copper & Aluminum Working Frequency: 1520s / 333hz Size: 40.5 * 40 * 20mm Package Information: Package Size: 6*5*3cm Package Weight: 65g Gift Box Package Packing List: 1* 20KG Digital Servo 1* 25T Servo Arm