The right screwdriver should always be used for each job, but there are so many variations that users often tend to make do with what is available.
The range of Variations Include:
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Tip Sizes
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Tip Shape
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Blade Shape
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Sizes and Widths
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Handle Shape
The above variations should not be seen as the weakness of the complusive tool buyer but the strength of a good tool kit.
The length of the screwdriver descibes the length of the blade and not the length overall.