Unique, patented tip slides back and forth from 1/4 inch and 5/16 inch hex sizes. A simple twist of the thumb nut locks in the tip setting. Magnet in hex keeps screw in place regardless of which driver is selected. Classic Cushion-Grip handle for added torque and comfort. Learn more at http://www.kleintools.com/catalog/specialty-screwdrivers/hvac
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