C.S. Osborne Rawhide Split Head Hammer Replacement Faces. Replacement faces for size 2 Osborne split head hammers. No trouble to replace faces. Just loosen the safety nut, remove the worn face, replacement and tighten. Made in USA. C.S. Osborne Rawhide Split Head Hammer Replacement Faces. Replacement faces for size 2 Osborne split head hammers. No trouble to replace faces. Just loosen the safety nut, remove the worn face, replacement and tighten. Made in USA. 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.