This is a gauge that you can use to adjust the Camber on your RC Car. Allows for +/-5 degrees of camber adjustment. You will need 3mm hardware to assemble the halves. Simply tighten the front and rear nuts to barely allow the center part slide.
The 100mm tall center if designed to sit against the wheel to check adjustment.
The Through Axle design is designed for you to slip a 5mm axle shaft into it without the tire attached and check/adjust the camber. (This method is recommended to use one gauge on the left and right at the same time.)