Klein Tools Metric 6-Point Socket, 3/8-Inch Drive

Yes. The drive size is 3/8 inch square, so they mount on any standard 3/8-inch drive ratchet, breaker bar or extension. If your ratchet is 1/4-inch or 1/2-inch drive you'll need an adapter or a different socket set.

These are 6-point. The six flats contact the sides of the hex rather than the corners, so they're the better choice on tight, rusted or already-rounded fasteners where you don't want to strip the head. A 12-point engages every 30 degrees instead of every 60, which helps in cramped spots with limited swing, but it grips the corners and is easier to round off. For MRO and field electrical work, 6-point is the safer default.

They're made in the USA and built in conformance to the latest issue of ASME B107.4, which is the standard covering hand socket wrenches. That matters on institutional and government purchases where tooling has to be spec'd to a published standard.

No. These are specified for use with socket wrenches, meaning hand ratchets and breaker bars. Chrome hand sockets aren't rated for impact tools; for a cordless impact wrench you want a socket specifically labelled impact rated.

Yes, each size is ordered individually by its own part number, so you can replace just the one you lost. The sizes and numbers line up directly: 65910 is the 10 mm, 65915 is the 15 mm, 65917 is the 17 mm.

Metric only. Every size in the range is millimetre marked, 10 mm to 19 mm. If your fasteners are inch sized you need Klein's SAE 3/8-inch drive sockets instead; a 13 mm is close to 1/2 inch but not the same, and swapping them rounds heads.

Chrome finish, which Klein specifies for lasting protection against corrosion and makes wiping off oil and grease straightforward. It's a standard hand-socket finish, not a black-oxide impact finish.