C.S. Osborne Split Head Magnetic Tack Hammer. Popular weights and sizes. Forged steel, carefully hardened. Fully polished split head. Best quality hickory handle. Made to U.S. Government specifications. Made in USA. Head length : 3-1/2" Head weight : 4 oz. Diameter of magnetic face : 1/4" Overall length : 11" C.S. Osborne & Co. is a manufacturer of specialized hand tools designed exclusively for upholsterers, auto trimmers, awning and canvas workers, furniture makers and other professionals in related trades. For generations, the family run business has always taken great pride in engineering the highest quality tools and offering our products both here in the United States and abroad. C.S. Osborne produces the most extensive line of custom tools available -and we guarantee that our tools will deliver excellent quality and superior performance.