Although the holes in most Technic bricks are centered
between the studs, you will find variants of 1×1 and 1×2
Technic bricks that have holes aligned with the studs—for
example, see Figure 2-4. When the studs are aligned with
the holes, the number of holes and studs is equal. Such an
arrangement is useful for compact building with densely
packed pins and axles, and these pieces can also be used to
align pieces by half of a stud.