This is the Futaba BLS452 Brushless Digital High Torque, High Speed Servo. BLS452 is designed for steering in nitro or electric on and off-road vehicles.

FEATURES:

Equipped with a Brushless motor that lasts longer and operates at a lower temperature than Brushed motors
Samarium Cobalt magnets and dual ball bearings
Same power consumption and centering as Digital servos equipped with Brushed motors
Standard size

INCLUDES: Futaba BLS452 Brushless Digital High Torque, High Speed Servo with accessories

SPECS:
Torque: 14.0Kg.cm at 6.0 V
Speed: 6.0V 0.14 sec / 60 degree
Dimensions: 40.0 x 20.0 x 36.8mm (1.6 x .8 x 1.4" )
Weight: 58 g
Ni-Cd use only
use the horn set screw supplied with the servo.
(Screw size:3 x 8mm) The servo hotn can be used the only 3mm in diameter of the hole center.