Klein Tools 65504 3/8-Inch Drive Socket Wrench Set, 12-Piece

The 65504 set covers eight sockets on 3/8-inch drive: four 6-point sockets in 3/8, 7/16, 1/2 and 9/16 inch, and four 12-point sockets in 5/8, 11/16, 3/4 and 13/16 inch. Rounding out the 12 pieces are a 5/8-inch spark plug socket, a ratchet, and two extensions at 1-3/4 inch (44 mm) and 6 inch.

No. Every socket in the 65504 set is 3/8-inch square drive, so it mates only with 3/8-inch drive ratchets, extensions and adapters. The set comes with its own 3/8-inch ratchet and two extensions, so you don't need another driver to use it. To run these on a 1/2-inch breaker bar you would need a 3/8-to-1/2 step-up adapter.

The 65504 carries both patterns on purpose: 6-point sockets in the smaller sizes (3/8 through 9/16 inch) grip flats more fully and are the ones to use on rounded or heavily torqued fasteners, while the 12-point sockets in the larger sizes (5/8 through 13/16 inch) engage every 30 degrees, which is what you want in tight quarters like a panel or a strut channel where you can only swing the ratchet a short arc.

It's built for that. The 65504 ships in a hinged metal box that keeps all 12 pieces together, and the whole kit measures 9.36 by 4.095 by 1.89 inches and weighs 3.62 lbs, so it drops into a bag or truck drawer without taking a shelf. Size coverage is nut-and-bolt work in the 3/8 to 13/16 inch range, which is the usual range for strut, pipe hangers and equipment fasteners.

The 65504 handles depth with extensions rather than deep sockets. You get a 1-3/4 inch (44 mm) extension for clearing shallow obstructions and a 6-inch extension for reaching down into equipment housings or behind a panel. If you need to run a nut down a long length of threaded rod, a deep socket is still the better tool, since the sockets in this set are standard length.

All sizes are SAE fractional inch, from 3/8 inch up to 13/16 inch, on a 3/8-inch drive. There are no metric sockets in the set, so for metric fasteners you'd need a separate metric set.

A case is included. All 12 pieces store in a compact hinged metal box, so there's nothing extra to order to keep the set together on a job.

Yes, a 5/8-inch spark plug socket is one of the 12 pieces, which covers the common plug size on small engines and generators. Paired with the 6-inch extension it reaches plugs recessed in a shroud.

Order Klein Tools 65504. That is the manufacturer part number for the 12-piece 3/8-inch drive socket wrench set with both 6-point and 12-point sockets.

Klein's instruction for the 65504 is to always wear approved eye protection when using it.