This is the Hitec HS-755MG Giant Scale Metal-Geared Dual Ball-Bearing Servo. This servo has the universal connector, so it will work with all current JR, Hitec, Futaba, and Airtronics Z radio systems and wiring. This produces nearly 200 oz/in of torque at 6V.
One HS-755MG giant dual BB servo with Hitec/JR/Z tupe connector
One servo accessory package containing:
One 1" (26mm) single arm servo horn(pre-installed on servo)
One 1.3" (33mm) single arm servo horn
One 2.3" (58mm) dual arm servo horn
One 1.7" (43mm) diameter servo wheel
One 2.8" (71mm) dual arm servo horn
Four brass eyelets
Four servo mounting screws
Four rubber grommets
Speed: 0.28 / 0.23 sec @ 60 deg.
Torque: 166.64 / 199.97 oz.in (4.8v/6v)