Graphics Reference
In-Depth Information
Figure 2-14. A bolt head inside a counterbore hole, sitting just below the surface.
Now, to drill all these holes, you can use spade drill bits or twisted bits like the ones shown in
Figure 2-15.
Figure 2-15. Spade drill bits (on left) and twisted bits (on right) will work for drilling straight-through and
counterbore holes.
 
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