This is the HPI SM-1 micro servo.
Features: Used as a steering servo for the HPI 1/18 scale Mini Recon truck
Includes: HPI SM-1 Micro Servo with Universal Connector (servo horn not included, reuse original from kit)
Dimensions: 0.88 x 0.47 x 0.92 (22.5 x 12 x 23.3mm)
Specs such as torque and speed are not supplied by the manufacturer