These pocket screwdrivers have the size (and shape) of a quarter. The edge is shaped like a ramp so they can be used for different screw sizes. The range of edge thickness goes from 0.030" to 0.090". They are specially good for flat screws but can be used for Phillips too.They are certainly more convenient than using a coin, the nails (ouch!) or other objects. You can carry them in a keychain, wallet, etc. The pricing is $7.20 for a dozen and you can read more about this curious item at Lee Valley's web site.
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