The Ironridge UFO-STP-30mm-B1 Rev A Stopper Sleeve Mill 30mm is a black electrical accessory designed for use in solar racking systems. With a current output of 10 A, this IronRidge model is specifically designed to provide a secure and efficient connection for solar power supplies. Perfect for home improvement projects involving alternative energy sources, this stopper sleeve mill offers a reliable solution for integrating solar panels into your electrical system. I do combine shipping.