The Allen EZ-Aim Steel Gong Target with 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.Features Steel constructionUsed with 2" x 4" lumber3/8IN steel hookHolds steel targets with center holeHoles for attaching with boltNo tools necessary