The Klein Color-Coded Magnetic Hollow-Shaft Heavy-Duty Nut Driver, 5/16-in. (654516MAG) is a magnetic hand tool designed for driving 5/16 in. hex nuts and bolts, including nuts run onto threaded rod. It has a standard 5/16 in. six-point hex socket and a yellow color-coded handle.

The shaft is hollow from tip to handle, so the driver never bottoms out on the end of a rod. A rare-earth magnet sits behind a brass inner sleeve and strike plate, which protect it from loss and from sharp threads. A cold-forged steel wrench-assist hex lets you add torque with a wrench, and the six-point hex socket maximizes contact to reduce the risk of stripping.

The shaft is 5-1/8 in. (130 mm) long and the driver is 8 in. (203 mm) overall. The Cushion-Grip handle is cellulose acetate, 1-1/4 in. (32 mm) in diameter, and the whole driver weighs 5 oz (142 g). It is not insulated and does not protect against electrical shock. Always wear approved eye protection.

Hold the Nut, Skip the Fumble

The Klein 654516MAG is a 5/16 in. nut driver with a protected magnet and a full pass-through shaft.

• Who it's for: Anyone running nuts onto threaded rod or working with 5/16 in. hex hardware.
• Why it stands out: Magnet protected by a brass sleeve and strike plate, plus a wrench-assist hex for extra torque.
• Worth knowing: It is not insulated. Klein also makes a non-magnetic version (654516).