Aluminum Channels are the building blocks of your robotic creation and
serve as the back bone to your project. These channels can serve as connection
points for servos, motors, and shafts, while also providing an easy to assemble
structure. Each aluminum channel has exterior dimensions of 1.5" wide by 1.5"
tall, interior dimensions of 1.32" wide by 1.41" deep, a 0.09" thick wall,
utilize both the 1.5" and 0.77" hub patterns, and are 3.75" long.