I hadn't seen those before but same idea. The adjustment for the lower portion is an interesting idea. That does allow a guy a super quick way to setup a car's ride height for different size tires and wheels. Should be a nice tool for a chassis shop or even a home shop where a guy is trying to figure out the best ride height for a car.

Thanks everyone for the feedback, seems like there is enough interest to make a few sets and put them up for sale.