This is the HS-485HB Premium Standard Servo from Hitec.
FEATURES: Ideal for 1/10 scale vehicle steering and throttle applications, .20-
.60 class aircraft, boats and all EP and GP .30-.50 class helis
Karbonite gear train that is four times stronger than standard
plastic gears
Three pole motor and single ball bearing output shaft
INCLUDES: HS-485HB Premium Standard Servo, 0.94" (24mm) diameter round horn,
1.2" (31mm) diameter 4-point horn, 1.3" (34mm) double arm horn,
1.2" (30.5mm) single arm horn, four each rubber grommets, eyelets
and mounting screws, universal connector
REQUIRES: Installing in model and connecting to control linkage and receiver
SPECS: Size: 1.57 x 0.78 x 1.49" (40 x 20 x 38mm)
Weight: 1.59oz (45g)
4.8V 6.0V
Speed: 0.20 sec 0.17 sec
Torque: 5.2 kg/cm 6.4 kg/cm
Drivetrain Type: Top ball bearing