This is the Arrma ADS-7M Waterproof Metal Gear V2 Steering Servo.
$36.99
Arrma ADS-7M Servo with Futaba style Connector, 1.2" (32mm) diameter
 6-Point Horn, 1.5" (39mm) diameter 4-Point Horn, 1.5" (39mm)
 Double Arm Horn, 0.83" (21mm) Round Horn, four each Screws,
 Grommets and Eyelets
Dustproof and waterproof in normal usage when mounted to a vehicle
 Ideal for use as a steering or throttle servo in 1/10 scale vehicles
 used for backyard bashing
 Dual ball bearings
 Metal gears