Klein Tools 1/4-Inch Nut Driver with 3-Inch Shaft

No. The 630-1/4 is not insulated and will not protect against electrical shock. Use it only on de-energized equipment. If you need to work near live conductors, you need a properly rated insulated 1000V-rated driver instead, not this one.

Yes, the shaft is full hollow, so it slips down over long bolts and studs rather than stopping at the nut. That is what makes it useful on stacked circuit boards and standoff hardware where the threaded rod runs past the nut. Shaft length is 3 inches, with 6.75 inches (17.2 cm) overall.

Tip type is the only difference. The 630-1/4 has a standard hollow socket tip; the 630-1/4M is magnetic, which holds the nut or hex-head screw on the tip so it does not drop into a panel or a ceiling cavity. Pick the magnetic version for overhead and blind work, the standard version when you are running over long studs or working around anything you would rather not magnetize.

The 3-inch shaft is the standard length and covers most panel and box work, at 6.75 inches overall including the handle. If you are reaching past 3 inches of depth, such as down a deep gang box or into recessed equipment, you want a longer-shaft or extra-long-shaft nut driver rather than this one.

Two ways. The handle end is color coded (red on the 1/4-inch), and Tip-Ident marks the size on the tip end so you can read it without pulling the tool out. Handy when several Cushion-Grip drivers are sitting in the same pouch.

The shaft is steel with premium chrome plating for corrosion resistance, anchored into a rubber Cushion-Grip handle with internal flanges so the shaft does not twist loose under torque. Made in USA and meets or exceeds applicable ASME/ANSI specifications. It weighs 0.2 lbs, so it is no burden in a pouch for an MRO or maintenance tech carrying a full set.