In engineering, woodworking and construction, nails refer to sharp hard metal (usually steel) used to fix wood and other objects. Hammers drive nails into objects. [2] There are also electric nail guns and gas nail guns. Nails, therefore, can stabilize objects by their deformation and by friction.

The iron nail, with a flat head at one end and a sharp end at the other, is mainly used for fixing or connecting. There are many kinds of iron nails, including ordinary nails, felt nails, cement steel nails, headless nails, shot nails, and roll nails. The surface is galvanized and copper plated, which shall be selected according to actual needs.