The connector is made of high-quality PA66 & PA6 nylon, which is flame-retardant, high temperature resistant, high toughness, abrasion resistance, strong resistance, increased ABS material, and safe to use. The good-quality rubber seal makes it better dustproof and waterproof, waterproof level: IP67. The female & male terminal is composed of pure copper and phosphor copper, which has high conductivity. Easy to install under welding and crimping.?If you don’t know how to install, please feel free to contact us and we will guide you on how to install.? Used for cars(such as Ford, Dodge, Chevy, Toyota, Nissan, etc. ), motorcycle, boat and other wire connection. 30-day money-back guarantee for any reason, 12-month warranty for quality-related issues. If there are any issues, simply contact us, our customer service team will make it right for you ASAP. We would like to send you a replacement for free or send the refund until you were satisfied.