Differend screw ?? steel screws steel wood screw steel wood self tapping screw steel self tapping screw please tell...

steel screws
steel wood screw
steel wood self tapping screw
steel self tapping screw

please tell me what i use them for and the difference appreciation :p
Lead pipe or brass?
Answers:    The thread on steel screws is wider than wood screw so ideal for biting into rawl plugs etc...

Wood screw have smaller quantity thread but easier to screw into and hold wood.

Wood self tapping screw have a different shutting down so they dig and drive contained by easier.

Self tapping screw are normally used where on earth you drilled a hole in steel plate and the screw tap (threads) the steel as it goes contained by.

A screw is not just a screw and you will throw profoundly out when you use Spax screws because these are spot on.
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what?