Nails and Pins
From DT Online
Most Nails are made from cold drawn mild steel wire. This process improves the strength or wire by work hardening such that Nails can be driven into timber by use of Hammers.
The holding power of nails depends upon Friction and some nails have coatings or grips designed into the body of the nail (i.e. shank) to improve this. Alternate nais may also be driven in at opposin angle as shown. This is a process known as Dovetail Nailing
Safety Point! Professionals may also use Nail Guns but these are extremely dangerous and not suitable for school use.