| Larger size general-purpose drills with 1/2 IN reduced shank; Standard 6 IN overall length and 3-1/8 IN flute length for increased rigidity, less deflection, and better hole accuracy; Standardized lengths result in minimal adjustment during tool changes in screw machines and machining centers; Ideal for portable drilling due to increased rigidity; Black oxide surface finish increases wear resistance and adds lubricity, improving chip flow; Round shank for a more positive grip in the drill chuck; Use wherever maximum chuck capacity is 1/2 IN |
| Larger size general purpose drills with 1/2 in reduced shank |
| Round shank or shank with three flats for a more positive grip in the drill chuck, flats reduce drill slippage under high load |
| Standard overall length and flute length for increased rigidity, less deflection and better hole accuracy |
| Standardized lengths result in minimal adjustment during tool changes in screw machines and machining centers |
| Black oxide surface finish increases wear resistance and adds lubricity, improving chip flow |
| For portable drilling due to increased rigidity |
