This is a pocket-style wheel to have a pine car Tungsten weight holder inside of it for RC Crawler vehicles, like Sportsman/Sporty/Shafty, Pro Comps, and others.
Here is a video of the wheel mounted on my front axle: https://youtu.be/fteihdgnqi0
There are two "wheel wall" options, one to glue the tire on (slim 2mm and thick 3mm version) and another that will work as a bed-lock. I like to have bed-lock on the front of the wheel (so you can change the face of the wheel if you need/want) and glue-on in the back for front wheels. This results in a skinny wheel in the front to help clear obstacles.
On the rear axle, I prefer to use bed-lock on both sides, so I also include the bed-lock ring.