Information The Little Grip Kit makes a great addition to a small arm or mobile base. The gripper features injection molded components and mounting for two Hitec HS-422 servos (one for for open and close and the other for wrist rotate). The jaws open to 1.3" and the wrist rotates approximately 180 degrees. It needs only a screw driver for assembly. Use any of our Serial Servo Controllers or a microcontroller to operate the servos.