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A screw is a combination of simple machines.

it is in essence an inclined plane wrapped around a central shaft but the inclined plane (thread) also comes to a sharp edge around the outside.

The most common uses of screws are to hold objects together and to position objects.

A screw is a combination of simple machines.

it is in essence an inclined plane wrapped around a central shaft but the inclined plane (thread) also comes to a sharp edge around the outside.

The most common uses of screws are to hold objects together and to position objects.

A screw will usually have a head on one end that contains a specially formed shape that allows it to be turned, or driven, with a tool. 

Common tools for driving screws include screwdrivers and wrenches.

The most common uses of screw is to hold objects together and to position objects.

A screw is a combination of simple machines.

it is in essence an inclined plane wrapped around a central shaft but the inclined plane (thread) also comes to a sharp edge around the outside.

The most common uses of screws are to hold objects together and to position objects.

A screw is a combination of simple machines.

it is in essence an inclined plane wrapped around a central shaft but the inclined plane (thread) also comes to a sharp edge around the outside.

The most common uses of screws are to hold objects together and to position objects.

A screw is a combination of simple machines.

it is in essence an inclined plane wrapped around a central shaft but the inclined plane (thread) also comes to a sharp edge around the outside.

The most common uses of screws are to hold objects together and to position objects.

A screw is a combination of simple machines.

it is in essence an inclined plane wrapped around a central shaft but the inclined plane (thread) also comes to a sharp edge around the outside.

The most common uses of screws are to hold objects together and to position objects.