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Wood and chipboard screws can be screwed in without making a pre-hole. Very sharp and threaded along their entire length, they avoid splitting the wood when screwed in.
Countersunk Head Screws: suitable for fixing wood and plaster, as they allow full insertion into the substrate.
Round-head screws: for better surface contact. This is why they are used to fasten objects.
Chrome-plated brass suet drop screws have a milled round head in the shape of a lens to prevent snagging. More for decorative purposes, they are used to assemble wood that is to be dismantled.
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