Klein Tools 610M Nut Driver, Stubby Set, Hex Sizes 1/4-Inch and 5/16-Inch, Hollow Shaft, Magnetic Tip, 2-Piece Stubby nut drivers allow for work in close quarters Exclusive hollow shaft design with Rare Earth magnetic tip features unobstructed pass-through Set contains: 1/4-Inch (610-1/4M) and 5/16-Inch (610-5/16M) hex sizes Handles are color coded for easy identification Internal flanges provide solid, twist-resistant shaft anchor