Klein Tools 65131 2-in-1 Hex Head Slide Driver Nut Driver, 1.5-Inch

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.