The wheels are 4.5" in diameter and about 1 1/8" thick. There are two wheels included and they are modified to fit a splined servo shaft such as the Hitec standard servos. It includes 2 long screws for mounting the wheels on the servo shaft.
This is our prebuilt HD2-S robot modified with a 5 axis robotic manipulator arm. This robot has be loaded with all the options and is ready to ship.
100 pack of square cable tie mounts with adhesive backing. 3/4 inch.