Klein Tools 33524 Nut Driver Set, 1000V Insulated, 9-piece

Nine SAE sizes: 3/16, 1/4, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16 and 5/8 inch. There are no metric drivers in the 33524, so if your panel hardware is metric this is not the set you want.

Yes. Each driver in the 33524 set carries two-layer molded insulation and meets or exceeds IEC 60900 and ASTM F1505 for insulated hand tools, which is the 1000V AC rating electricians work to. Klein's own instruction is still to de-energize where possible; the insulation is there to reduce injury risk on incidental contact, not to make energized work routine. Only the insulated portion is protected, so keep hands off the exposed tip area and destroy any tool whose insulation is nicked or damaged.

Yes. The 33524 drivers use full hollow shafts, so a bolt or all-thread can pass up through the shaft instead of bottoming out. Shaft length is 6 inches, with overall tool lengths running 9.75 to 11.375 inches depending on size. That handles most strut, panel, and equipment bolting where the stud runs past the nut.

Klein's Tip-Ident marking on the 33524 drivers puts the size where you see it as you reach for the tool, so you are not squinting at the shaft. The set also ships in a black nylon case with custom-fitted pockets, so each of the nine drivers has its own slot and a missing tool is obvious before you leave the job.

Yes. Klein sells the case separately as Cat. No. 33534, so a cracked or torn case does not mean replacing the whole nine-piece set.

Keep them clean, dry, and free of surface contaminants. Moisture, oil films, and dust are conductive and defeat the insulation. Inspect before every use, and take any driver out of service and destroy it if the insulation is cut, cracked, or otherwise damaged. Klein also directs that only tools marked with the official 1000-volt rating symbol be used anywhere contact with an energized source is possible, so damaged tools should not be demoted to general use in an electrical kit.

The kit runs about 6 pounds. Case footprint is roughly 14.5 inches wide by 9.75 deep by 4.75 high, which is a flat lay-down case rather than something that stands in a pouch. Plan a shelf or drawer slot in the van for it.

Yes, the 33524 drivers are made in the USA, which matters on public and institutional jobs carrying domestic-sourcing requirements. Handles are Klein's cushion grip.