This is the Futaba S3170G Digital Planetary Gear Retract Servo.

FEATURES:
For up to .60 size airplanes with mechanical retracts
Metal planetary gears and dual bearings for smooth performance


INCLUDES:
Futaba S3170G Digital Planetary Gear Retract Servo with universal
connector


REQUIRES:
Installing in airplane, connecting retract linkage and connecting to
receiver


SPECS:
Torque: 94 oz-in (7.0 kg-cm) @ 4.8V
118 oz-in (8.5 kg-cm) @ 6.0V
Speed: 0.57 sec/60¢X @ 4.8V
0.47 sec/60¢X @ 6.0V
Size: 1.4 x .6 x 1.0" (35 x 16 x 26mm)
Weight: 0.9oz (26g)
Rotation: 180¢X