Klein Tools LL20 Long Arm Hex Key, 5/16-Inch, 100 Pack

No. The LL20 is not insulated and will not protect against electrical shock, so it should not be used on energized equipment. De-energize and verify before using it inside a panel or enclosure. Klein also warns against slipping a pipe or other cheater bar over it for extra leverage, and to wear approved eye protection.

5/16 inch, SAE, one size only. It will not serve as a substitute for an 8 mm metric socket head screw, and it is a single-size key rather than a folding or indexed set, so pick up the other fractional sizes separately if you are building out a full range.

Reach. On the LL20 the long leg runs 6.313 inches (16 cm) against a 1.563 inch (4 cm) short leg, so you can get a 5/16 inch socket head down into a recessed bore, past a bus bar, or through a knockout where a stubby key bottoms out. Use the short leg in the handle position when you need torque in tight quarters, and the long leg when you need to reach and spin fast.

Yes, the LL20 is made in the USA, which matters if you are buying against a domestic-content requirement on a public or institutional job. The manufacturer part number to put on the purchase order is LL20.

The LL20 is finished with rust and corrosion resistant surfaces, which is what you want for a key living in a service van or a pouch that sees weather. It is still a bare steel tool, so wipe it down after wet work.

It runs 2.9 oz (82 g), listed elsewhere as 0.18 lbs, and overall it measures 5.625 x 1.575 x 0.338 inches. That drops into a standard pouch pocket or a van drawer without a case.