How to Drill Long Holes
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The average length of standard wood drills is about equal
to the distance the average quill can be extended. This distance
is approximately four inches. Deeper holes are long holes.
Long holes are drilled in lamp bases, posts or columns for
supporting electrical fixtures, and to contain wire or conduit.
Hollow shafts and cylinders of small diameter are made by
drilling long holes. The clearance and pilot holes for deeply
set screws frequently require long hole drilling procedure.