| Long series combined drill and countersinks are used for producing center holes in components or workpieces with the extra length allowing access to difficult-to-reach areas |
| Drill and chamfer in one pass |
| HSS is the most popular general purpose tool steel |
| Extra length permits access to hard-to-reach applications |
| HSS provides good wear resistance |
| 90 deg chamfer is frequently used to seat the underside of metric fasteners |
| For producing center holes in components or work pieces with the extra length allowing access to difficult-to-reach areas |
