Very nicely made plates, well finished and finely finished. I mounted the spacers and checked the dimensions with a caliper. Everything is within 0.001 inch, which is key to the accuracy of your measurements. Both roulettes were also tested directly for money. I had a car in a tire shop with a "modern" laser shelf. Drawn three more times. I abandoned her (perhaps her stand is our calibration stand) and made it myself (just a sock). Found a wheel pretty. Set it to the mfg spec, just like an arrow. Used small bungee cords over the rim to keep the plate tight on the wheels, one man job. Hats off to Tenhulsen!