Klein, 9-in-1 Pass Through SAE Multi-Nut Driver, Magnetic. Magnetic Nut Driver allows for one-handed driving, with ninesizes in one tool: 3/16, 1/4, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16, 3/4-Inch Pass through handle and barrels for fasteninghex nuts onto threaded rod of any length Strong, Rare-Earth magnets securely hold nuts and bolts: 1/4-Inch, 5/16-Inch, 11/32-Inch, 7/16-Inch. Spring coil holds nuts and bolts in place without the use of magnets: 3/8-Inch, 1/2-Inch, 9/16-Inch, 3/4-Inch. Extended wrench-assist on barrels for added torque on tough jobs. Color-coded bands for easy identification. Heavy-duty, Cushion-Grip handle for greater torque and comfort.