Table 3-3.--Screw Sizes and Dimensions
Metal dowels (usually brass) are sometimes
Metal dowels (fig. 3-53) are self-centering. The
used. They do not damage easily, and they do not
lower portion of the threaded end locates its own
absorb moisture from the molding sand.
center in the bored hole. It also holds the dowel to
Table 3-4.--Drill and Auger Bit Sizes for Wood Screws