This is all steel and fully functional 15" vintage monkey wrench. It is stamped on both sides of tool. One side reads MADE UNDER L. COES PATS. the other side reads COES WRENCH CO WORCESTER MASS USA. This tool was also made around the turn of the century and is highly prized by collectors. They just don't make them like they used to. 15 inches long and weighs about 6 pounds, jaws open smoothly to over 2 1/2" wide.