Got an ARRMA KRATON or OUTCAST that loves to flip backwards? This wheelie bar helps keep the front end down when you punch the throttle. It's made from durable nylon with a light rubber bearing wheel (40mm diameter). The wheelbase is about 147mm, and it's designed to fit 1/8 scale ARRMA models like the KRATON 6S EXB (ARA106053), KRATON V5 (ARA8608V5), OUTCAST 6S V5 (ARA8611V5), and OUTCAST 6S EXB (ARA8710). Important note: If you have a KRATON V3 or V4, you'll need to upgrade your rear shock mount to the EXB or V5 version (ARA320580) for this to work. Installation is pretty straightforward if your rig is compatible. It just bolts on to the rear shock mount and spoiler area. Helps with stability during high-speed runs and big jumps, and just looks cool too. A must-have upgrade for bashing and performance driving. If you're not sure about fitment, double-check your model version before ordering. The seller is usually helpful if you have questions.