Jobbers length twist drills made of the finest high-speed steel. Heat treated to a hardness of 63–65 HRC and precision-ground to a tolerance of +0.0000 to –0.0003". Can be used on all metals. Made in USA.
Sold by the dozen.
| Brand | Blue Ribbon |
| Bur Material | High-Speed Steel |
| Country of Origin | United States of America |
| Diameter | 0.042" |
| Package Size | Pkg. of 12 |
