Klein Tools 647M Tool Set, Magnetic Nut Drivers Sizes 3/16, 1/4, 5/16, 11/32, 3/8, 7/16, 1/2-Inch, 6-Inch Hollow Shafts, 7-Piece
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The shanks are all six inches in length. The 1/2" and 7/16" have a total length of 10 3/8", while the rest have a total length of 9 3/4". The shorter ones have slightly smaller handles, which explains why they're shorter. My Klein 5140 canvas bags were able to hold them all.
This collection isn't metric in any way. The "M" at the end of the model number refers to "magnetic" rather than "metric." These are SAE nut drivers with sizes ranging from 1/4 inch to 1/2 inch.
Sizes range from 1/4 to 1/2 inch in standard sizes. 1/4, 9/32, 1/4, 9/32, 1/4, 9/32, 1/4, 9/32, 5/16, 3/8, 7/16, 1/2, and I'm sure there's one more that I'm overlooking. It's not quite a quarter, maybe a third of a quarter. That, as well as the 9/32, is something I almost never use.
Yes, the shanks are hollow.
Selected User Reviews For Klein Tools 647M Tool Set, Magnetic Nut Drivers Sizes 3/16, 1/4, 5/16, 11/32, 3/8, 7/16, 1/2-Inch, 6-Inch Hollow Shafts, 7-Piece
I bought these to help me with my pinball machines on occasion. These were a godsend at first, and they worked flawlessly. The magnets inside the driver head, however, have begun to crumble after just over a year. If they simply fell out, it wouldn't be so bad, but they literally crumble. The magnet dust/particles then become stuck inside the driver head, preventing them from completely covering the side of the nut you need to drive. To give you an idea of how often I used these, I only used them once a month on average for the past ten months. I believe they should work for a longer period of time.
I got two 3/16 nut drivers but no 5/16 nut driver, which is unfortunate because I didn't care for the 3/16 but desperately needed the 5/16. Furthermore, neither of the 3/16 nut drivers has a hollow shaft. The description states that it is not a fully hollow shaft, which may lead one to believe that it is partially hollow (other brands occasionally have an inch of hollow shaft). No, it's just a regular nut driver with a solid metal shaft. They stuffed a small magnet inside and covered it with glue to make it magnetic. This means that you can get a nut into it (although one of the 3/16 drivers magnets was off center, so maybe not), but as soon as you start turning the nut onto a bolt/stud, the magnet will touch, causing the nut driver to fall off the nut. As a result, the 3/16 should be referred to as a nut starter rather than a nut driver. br>br>It's also worth noting that the 1/4 nut driver lacks a magnet.
The long drivers are great, and the magnetic retention is fine - I bought this set to help me disassemble, repair, and reassemble a fireplace insert. It's not overly powerful, but it'll get the job done. My only complaint, and the reason for the three stars, is that the smallest size is useless due to the plastic that holds the magnet in place in the socket. Cutting out the plastic and removing the magnet is the only way to make it usable. The socket will not accept a screw head unless this change is made. I returned the first set, assuming it had been manufactured incorrectly, but the second set had the same issue. It's difficult to believe Klein is unaware of the error, but if they are, one would expect them to correct it.
A good set of nut drivers is an absolute must. There are no other six-point hex sockets with magnets that I am aware of. Please, Klein, figure out a better way to install the magnets. br>I have several sets, and every time one of the magnets cracks and falls out, I am disappointed. br>br>In one set, I had a couple in 5/16's that couldn't fit around the nut because the magent was too large or something: (br>I ordered a few replacement 5/16's and they fit perfectly.
Klein tools are my favorite and I've been using them for a long time. br>I spent over 35 years in the communications industry, and my employer provided Klein tools. br>As for the Nut Driver Set, I think it's pretty cool. The magnets were reported to have fallen out in a few reviews. That has never been an issue for me. br>I'd buy anything made by Klein; their tools are excellent. The only disadvantage is that they are costly. br>While anything can wear out or break, Klein tools will outlast most careers if properly maintained.
When putting screws in and out, do a good job of holding them in place so they don't fall into the machinery. It's a plus if the sizes are color coded. They appeal to me greatly.
Because I work as an HVAC technician, I use these on a daily basis. I've had them for about a month and I absolutely adore them. They're tough, lightweight, and have powerful magnets. I'm confident that these will serve me well for a long time.
Magnet tips are inexpensive and easily broken. The 11/32 magnet tip on these nut drivers broke TWICE after I bought them. I had to go through the entire process the first time, print the receipt, ship to Klein, and then wait four weeks for your new set to arrive. I used the new set for about two weeks before the 11/32 broke again, and all I'm doing now is removing ballasts from fixtures. These are ones I would avoid. Klein has changed a lot over the years. It's also inconvenient because no one else makes magnetic nut drivers with a long shank. For my impact, I'm going to get the Wiha ones.
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