Nuts, adj.: what you must be to attempt this job.
The standard nut
Most commonly used with roofing bolts
Has 2 wings
Designed for tightening by hand
Nylon lock or nylock nuts
The ring of nylon creates friction, preevnting the nut coming undone by itself.
A nut that fixes to a hole in sheet metal.
Has spikes and Fits into a hole in wood
A hollow screw, into which screws a bolt.
Used to fix cabinets together
The bright polished dome on the topside of the nut looks nice
The tool driven portion of the nut shears off when tight, leaving a nut that can not be undone with any tye of nut driver.
A high security nut