These are sets of Paco Motorsports camber bolt locks & Mazda camber bolts & nuts.
The stock camber adjustment bolts don’t stand up to the abuse of autocrossing.
Paco Motorsports offers a clever solution.
Paco Motorsports locks replace the slotted washer on the stock camber adjustment bolts.
Install them on the front and/or rear lower control arms to assure that your alignment settings stay put.
The teeth on the lock represent increments of +/- .25 °
Sold in sets of 4 or 8.