RP-SMA male jack bulkhead to RP-SMA female plug pigtail. This item is 8in long, coax is rated RG316
These large Tiller Traction Lug wheels are 13" in diameter. They come as pair and have steel 5/8" diameter shafts and bearings.
Waterproof ultrasonic distance sensor. This sensor can be used for collision detection in your project.