DS3218 180 Degree Digital RC Servo 20KG Torque Waterproof Metal RC Servo Motor Product High performance digital standard servo, can be common use in robots, mechanical arms, climbing cars and remote control toys. The main features are fast heat dissipation,big torque high compatibility ,sensitive and responsive ect. Good choice for university professors and students who are interested in developing software for robot parts. Features: High-precision metal gears with hard anodizing CNC aluminium middle Shell, water proof rubber seals screws Sepcification: Item: DS3218MG Stall Torque (5V): 19 kg/cm (263.8oz/in) Stall Torque (6.8V): 21.5 kg/cm (298.5 oz/in) Dead band: 3s Speed : 0.16 sec/60(5V) / 0.14 sec/60(6.8V) Operating Voltage: 4.8 ~ 6.8 DC Volts Weight: 60 g (2.12 oz) Motor Type: DC Motor Gear Type: Copper & Aluminum Working frequence: 1520s / 333hz CE Certification: Yes Size: 40.5 x 40 x 20 mm Package Included: 1 x DS3218MG Digital Servo 1 x 25T Adjustable metal servo arm 1 Set parts Have a great time shopping!