Tired of the stock hinge-pins backing out of the A-arms? If you’ve been running your Traxxas vehicle long enough, you most likely have already experienced this problem. ST Racing Concepts Heat Treated Polished Steel Lock-Nut Style Hinge-Pin Kit will solve this problem once and for all. CNC Machined from high-quality 12.9 grade carbon steel, that is then heat treated for increase in durability, and then polished for ultra smoothness. Nylon insert lock-nut at each end of the hinge-pin prevents the pins from ever coming loose. This is a great upgrade for your Traxxas Slash, Stampede, Rustler. Sold as a complete set of 8 hinge-pins and lock-nuts. (Silver)