A lovely set of original early 20th century bits by the Irwin Auger Bit Company of Wilmington Ohio. The shanks are marked Irwin US of A (13/16 is a slightly later replacement made by the same company) which we know was in use in 1924. Sizes: 4 to 16 by sixteenths plus a matching Irwin US of A No.2 expansive bit (7/8 to 3").
Supplied in a Workshop Heaven 12 pocket canvas tool roll with a new auger bit file.
