Steel Machine Key 3/16" x 3/16", 3/4" long. These keys are economical with high strength and will fit 3/16" keyways.
These large Tiller Traction Lug wheels are 13" in diameter. They come as pair and have steel 5/8" diameter shafts and bearings.
These are 8" inch diameter Mecanum wheels with custom shafts, lock collars, and bearings.
SparkFun's minimal design approach to Arduino. This is a 5V Arduino running the 16MHz bootloader.
The DSP Beacon can be used in both the Non-Inverse Architecture (NIA) and in the Inverse Archicture (IA).