The EZ AimA(R) Gong and Target Hanging Hook is designed to hold Gong or Steel targets with a center hole or a top-center hole. Main Gong Hanging hook is 3/8 inch steel. Heavy Weight Steel Body. Black Powder Coated. Permanent bolt on options. Steel construction Used with 2" x 4" lumber 3/8IN steel hook Holds steel targets with center hole Holes for attaching with bolt No tools necessary