Nut Driver, 5/16-Inch Magnetic Tip with 18-Inch Hollow Shaft Klein Tools 618-5/16M Exclusive hollow shaft design with Rare Earth magnetic tip features unobstructed pass-through, even on long bolts Hollow shaft facilitates work on bolt applications Cushion-Grip handle allows for greater torque and comfort Handle end is color coded for easy identification Internal flanges provide solid, twist-resistant shaft anchor Hollow shank that facilitates work on stacked circuit boards or other long bolt applications Internal flanges that provide solid, twist-resistant shaft anchor Premium chrome plating for smooth feel and corrosion resistance Handle end is color-coded for easy identification Color Code: Yellow. Hex Size: 5/16-Inch Overall Length: 21-3/4-Inch Shank Length: 18-Inch Weight: 0.50-Pound