This is an optional CRC Wide Ride Height Gauge, and is intended for use with CRC Xti 1/12 scale pan car. This gauge features a dual-sided adjustment; one side stepped and the other non-stepped. The stepped side features 0.5mm levels (up to 7mm) while the angled non-stepped allows for a more precise adjustment. The extra-wide gauge is great for the CRC Xti but works great for nearly all on-road cars, front or rear.