| Keo bell type combined drill and countersinks are used for producing protected center holes in components or workpieces which require machining between centers as the additional 120 deg included chamfer eliminates the risk of deforming the countersink seat |
| 0.35 in Dia bell |
| Drill and chamfer in one pass |
| Bell at bottom of chamfer provides a "seat" to prevent deeper penetration |
| The additional small 120 deg chamfer on the bell type protects the edges of the 60 deg center hole |
| HSS is the most popular general purpose tool steel |
| For producing center holes in components or work pieces with the extra length allowing access to difficult-to-reach areas |
