Robotic wrist kit, with three - count 'em!, three! --
degrees of freedom (technically, radial flexion-ulnar flexion and
flexion-extension movements of the wrist, and pronation-supination of the
The wrist kit works with most any standard size R/C servo
-- three are required. The servos are not included. We recommend most any
inexpensive standard-size servo, such as the Hitec HS-311 or Cirrus CS-71.
With four servos, you can build a sophisticated 4 DOF
(degree of freedom) end-effector.