C.S. Osborne 3 Lb. Dead Blow Hammer. Minimizes damage to the struck surface and controls force with minimal rebound. Head is filled with shot, which absorbs the impact of a strike, reducing the bounce-back. Osborne No. : 391-3. Diameter of head face : 2-1/4". Total length : 15". Weight : 3 Lb. Used in many applications. Other size hammers are also available in our shop. C.S. Osborne 3 Lb. Dead Blow Hammer. Minimizes damage to the struck surface and controls force with minimal rebound. Head is filled with shot, which absorbs the impact of a strike, reducing the bounce-back. Used in many applications. Other size hammers are also available in our shop. Osborne No. : 391-3 Diameter of head face : 2-1/4" Total length : 15" Weight : 3 Lb. 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.