This is the Hitec D645MW D-Series Metal Master Servo.
Includes:
Note: Programmable features require Hitec Servo Programmer sold separately HFP-30 and DPC-11
Features:
Specs:
Motor Type: 3 Pole
Bearing Type: Dual Ball Bearing
Speed (4.8V / 6.0V / 7.4V): 0.28 / 0.20 / 0.17 sec/60-degrees
Torque oz-in (4.8V / 6.0V / 7.4V): 115 / 158 / 180 oz-in
Torque kg-cm (4.8V / 6.0V / 7.4V): 8.3 / 11.4 / 13.0 kg-cm
Size in Inches: 1.59 x 0.77 x 1.48 in
Size in Millimeters: 40.6 x 19.8 x 37.8 mm
Weight: 2.11oz (59.8g)
Number of Teeth on Spline: 25
Diameter of Horn Screw: 3mm