1、Durable Material: This RC 45KG servo is made of aluminium alloy plus steel material, smoothing surface, sturdy and durable, ensuring stable performance and long service life. 2、Quick Response: This brushless and waterproof servo with all steel gear features accurate control, quick response and high torsion. 3、Stable Structure: This brushless servo with waterproof design can be easily installed and detached, working in low noise and quick response. 4、Aluminum Alloy: This RC waterproof servo adopts aluminium alloy shell, the maximum torsion is 45KG. 5、Servo Arm: This 45KG brushless servo comes with a 25T servo arms, providing buffer and protection for your RC car, effectively transfer power and execute the command of servo accurately. Item Type: RC 45KG Servo Material: Aluminum Alloy Color: Black Rated Torsion: 6V 32kg.cm / 7.4V 38kg.cm / 8.4V 45kg.cm No Load Speed: 6V 0.17 Sec/60° / 7.4V0.14 Sec/60° / 8.4V0.12 Sec/60° Drive Mode: PWM Pulse Width Range: 500 to 2500μsec Midpoint Position: 1500μsec Maximum Angle: 180° Control Accuracy: 2μsec Control Frequency: 50 to 330Hz Gear Type: All Steel Gear Product Size: Approx. 41 x 40 x 20mm / 1.6 x 1.6 x 0.8in ( Manual Measurement, Slight Error May Exist ) Application: Suitable for Car Model, Boat Model, Aircraft Model, Underwater Robot, Underwater Robot Arm, Underwater Automation Equipment and So On. 1 x RC 45KG Servo 1 x 25T Servo Arm 2 x Screw