Designed by Brian Brazeal, this is the most efficient cutting hardy I know of. The cutting hardy is the most essential hardy tool! The tapered shank fits a few different sizes of hardy holes from about 3/4 inch to one 1-1/8, and is perfect for a 1-inch hardy hole in particular. Made from 4140, and not heat-treated because this tool is only meant to be used with hot steel. Contact me for any questions, or check out the “FAQ” page.