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All About Screwdrivers

Screwdrivers are usually classified as flat head or cross-headed. Cross-headed screwdrivers have cross-shaped tips. Take care to use the correct type, since a mismatch may damage the head of the screw or the screwdriver.

Excerpted from Do It Yourself Home Improvement

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Pozidriv Screwdriver

These are similar to the Phillips, except that between each cross-projection is a smaller projection that provides greater grip. The pozidriv cross-headed tips allow the screwdriver to fit into the head of a screw more securely than a flat-head tip, enabling you to apply greater rotational force.

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