Nut Driver Set, Magnetic 3-Inch Full Hollow Shaft, Sizes 3/16 to 1/2-Inch, 7 Piece Klein Tools 631M Full hollow shaft designed with Rare Earth magnetic tip facilitate work on long bolt applications Set contains Cat. No: 630-3/16M, 630-1/4M, 630-5/16M, 630-11/32M, 630-3/8M, 630-7/16M, 630-1/2M Cushion Grip handles allow for greater torque and comfort Tip-Ident quickly identifies nut driver hex orientation and size by color coding the handle ends so you can easily engage the nut driver with the fastener Internal flanges provide solid, twist-resistant shaft anchor 3/16-Inch does not have hollow shaft