HS-755MG Giant Scale Ball Bearing Metal Gear Large Servo from Hitec - HRC32755S
The HS-755MG "giant scale" servo is perfect for larger R\/C applications and feature metal gears, dual ball bearings with a water and dust resistant case. The powerful HS-755MG delivers a whopping 200 oz-in of torque at 6 volts.
Features:

Extreme torque
Dual ball bearings
Water and dust resistant case
Metal geared
Dual ball bearing output spline
Water and dust tight
Designed for use in large models

Includes:

1x HS-755MG giant scale ball bearing metal gear large servo
1x 1" (26mm) single arm servo horn (pre-installed on servo)
1x 1.3" (33mm) single arm servo horn
1x 2.3" (58mm) dual arm servo horn
1x 1.7" (43mm) diameter servo wheel
1x 2.8" (71mm) dual arm servo horn
4x brass eyelets
4x servo mounting screws
4x rubber grommets