C.S. Osborne 20 Stainless Steel Zipper Stops. Size 10 top stops for zipper chain and can be set using the Osborne #1012 Zipper Pliers. Made of stainless steel. You will receive 20 tops. 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.