A complete set.¼ inch through one inch.Fine condition and ready to use.Coarse screws for faster cutting in green and softer woods.From the IRWIN website:In 1884, Charles IRWIN owned a pharmacy in Martinsville, Ohio.A local blacksmith who was a customer of Mr. Irwin’s came up with the idea for a solid center auger bit.He sold the rights to the invention to Mr. Irwin and a year later, after patenting the auger bit, Charles Irwin, along with four other business partners, formed the IRWIN Auger Bit Co.








