On 6/8/2010 8:31 AM John spake thus:

If you want to use your 3" screws, you're going to need to drill
shanks in your 2x4's (shanks are holes that are wide enough so that
your screw can slide through without the thread catching -- you don't
want the thread catching both the 2x4 and the wall), so if you use a
counter-sync/shank combo, you should be be able to embed the 3" screws
a 1/2" into the wood easily enough. If you don't have one of those,
you might want to consider buying some 3 1/2 - 4" screws that have no
thread the top 1 1/2". That way you won't have to do any shanking,
and the shelves go up faster.

Right concept, but the correct term is "clearance hole" for the screw,
or counterboring it into the piece being held.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)