Feature: 1. Stable Performance: This RC servo steering engine features high accurate helical gear, wide working voltage DC6‑8.4V, premium coreless motor. 2. Programmable Servo: The RC gear servo has built in programmable PWM digital amplifier and 32 bit MCU with 14 bit magnetic encoder. 3. Complete Accessories: The kit comes with a servo, servo arm, screw barrel, rubber pad and screws to meet your installation needs. 4. Waterproof Shell: The servo motor adopts aluminum alloy heat sink housing, with IP67 waterproof grade, wear resistant and durable, long service life. 5. Wide Application: Our 50KG coreless programmable servo motors are perfect for RC cars, robots, robotic arms, etc. with excellent performance. Specification: Item Type: Coreless Servo Shell Material: Aluminum Alloy Color: Black Product Size: Approx. 40 x 20 x 38mm / 1.6 x 0.8 x 1.5in Working Voltage: 6V-8.4V Working Speed: 0.15sec/60° At 6.0V 0.12sec/60° At 7.4V 0.11sec/60° At 8.4V Stall Torsion: 38.0kg cm At 6.0V 45.0kg cm At 7.4V 50.0kg cm At 8.4V Connecting Wire Plug: JR Plug Pulse Width: 500-2500usec Deadband: 2usec Applicable: RC Remote Control Car, Robot, Robotic Arm, Etc.. Package List: 1 x Coreless Servo1 x Metal Servo Arm2 x Plastic Servo Arm4 x Screw Barrel4 x Rubber Pad6 x Screw