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a stud

subject: ENGINEERING
a small nail or piece of metal, with a large rounded top, that is hammered into or fixed to the surface of something, usually for decoration

a tack

subject: ENGINEERING
a small sharp nail with a flat end

a hammer

subject: ENGINEERING
a tool consisting of a piece of metal with a flat end which is fixed onto the end of a long thin usually wooden handle, used for hitting things

a nail

subject: ENGINEERING
a small thin piece of metal with one pointed end and one flat end which you hit into something with a hammer, especially in order to fasten or join it to something else

a screw

subject: ENGINEERING
a thin pointed piece of metal with a raised edge twisting round along its length and a flat top with a cut in it, which is used to join things together, especially pieces of wood
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