Which is the best metal extension cord for you? Riybro multi outlet power strip is rated among the best, with base specifications of 6 AMP, 240V. It has four sockets and one on/off button. Proper spacing is provided between the four sockets, which allows connection of plugs effortlessly. There is one common switch for all the 4 sockets. This extension cord of metal construction has a LED indicator which indicates whether the extension cord is receiving power supply or not. This surge protection power strip comes in white design with avant-garde copper cored wire.