#494 4 prong. Made with carefully tempered spring steel blades. The cutting edges are hand ground for excellent precision. When you want the best of the best, Osborne Tools are what you're looking for! All Osborne Tools are made in the U.S.A.! C.S. Osborne & Co. has flat set the standard in industrial hand tools, leathercraft tools and upholstery tools with their strict adherence to producing the highest quality tools and standards of service. Based in New Jersey; C.S. Osborne & Co. has been a family owned and operated business since 1826 and the seventh generation of the Osborne family still manages the company today, and continues the family tradition of producing the best possible tools in the industry! The Osborne Lacing Chisels featured here are forged in one piece from high grade tempered tool steel! Excellent for making slits in leather for lacing, cutting out designs or for making slits to attach certain hardware that needs a prong shaped hole for attachment. Very High Quality Chisels. The Thonging Chisels featured here are made with carefully tempered spring steel blades. The cutting edges are hand ground for excellent precision. Osborne tools do not come sharpened. Please see video below on how to sharpen.