1、Applicable Model: The 40KG RC digital servo with 25T servo arm is compatible with remote control models such as 1/8, 1/10, 1/12 trucks, RC cars, robots, ships. 2、Durable Materials: 40KG RC digital servo is equipped with sturdy copper and aluminum gears, CNC aluminum casing, and dual ball bearings, sturdy and reliable. 3、Waterproof Design: The 40KG high torsion RC servo has excellent waterproof performance and can adapt to different harsh environments, ensuring long term use. 4、High Rotation: The 40KG RC digital servo can control angles ranging from 0 to 270 degrees, with good linearity and precise control, enhancing perfect performance. 5、Excellent Performance: RC digital servo provides high speed, responsive, unimaginable efficiency, and low power consumption, having excellent performance. Item Type: RC Digital Servo Material: Aluminum Alloy, Plastic Servo Size: Approx. 40 x 20 x 41mm / 1.57 x 0.79 x 1.61in Operating Voltage: DC 4.8-8.4V Operating Speed (4.8V): 0.16sec/60degree Operating Speed (7.4V): 0.14sec/60degree Stall Torsion (4.8V): 36kg/cm Stall Torsion (7.4V): 40kg/cm Application: Suitable for 1/12 1/10 1/8 RC Cars, Boats, Robots, etc. 2 x RC Servo 2 x Aluminum Alloy Servo Arm 8 x Plastic Servo Arm 8 x Screw Grommet 8 x Shock Absorption Pad 14 x Screw