The listing is for a 4-ft rain chain extension made of pure solid copper. It is used to extend Copper Rain Chain of Single Loop. This extension chain is 4 ft long and can be easily added to your existing rain chain. Two pairs of pliers are needed to open the loop and hook the extension to your existing rain chain. Each loop is 3/16" (5mm to be exact) thick and measures 2 1/8" x 1 1/4". The V shaped attachment piece is not included.