Part Number: ST3215-HS Servo Motor 20kg. cm Bus Servo Motor, 106PRM High Speed, Large Torque, With 360 Degrees High Precision Magnetic Encoder, Two-way Feedback, Servo/Motor Mode Switchable Servo motor will provide various feedback like position, speed, torque lock, working mode (servo mode, servo motor mode, etc. ) for advanced projects requiring closed-loop automatic control. Ideal choice for building wheeled robots, 3D printers, etc. that require accurate closed-loop speed control or stepping control it can also be used for building quadruped robots, hexapod walkers, robotic arms and other robotic projects requiring multiple servo motors. Up To 20kg. cm Torque On 12V Voltage, Suitable For Building Quadruped Robots, Hexapod Walkers, Robotic Arms And Other Robotic Projects Requiring Multiple servo motors with large torque and high speed performance