Well up to today i had never heard of wiha but i just checked out their web page and i must say there stuff looks kinda lower end? I am going to have to say i guess i would stick with my Kleins. I would rather pay the bigger bucks and have it last.
Whoever claims that Klein makes absolutely the best screwdrivers is showing their lack of exposure. Don't get me wrong; Klein makes excelent screwdrivers, and many of them fit electrical screws better than more general types.
That said, AT&G drivers positively jump into your hand and beg to be used. Bahco drivers look simple, but also fit the hand well, and their two-handed big one is great. As for Wiha, I have their set with the shafts that go all the way through the handle- no fear of hitting these with a hammer!
My only problem with Klein drivers came when I worked around machine shops some; the 'cushion grip' caught metal shavings- which then cut me.
For most electrical work, I'll stick with Klein for most of my needs.
Oh- the worst screwdriver? Probably Channellock brand. Harbor Freight has them beat by miles!!!
WIHA tools are THE best tools I have ever seen and used. Absolutely no doubt. Their line of insulated (1000V) screwdrivers, nutdrivers, strippers, pliers are so well made and ergonomic that there is no comparrison IMHO.
Their expert selection of steel and superior heat treating processes make their tools last longer than others.
I have yet to see a Wiha screwdriver with a worn out tip, but most Klein's that I have seen become rounded. (I personally own only 1 Klein, but a co-worker has almost exclusively Klein, and they all look worn out to me, and he hasn't been in the biz very long, he does not abuse his tools either.)
I do use my Klein 10-in-1 on a daily basis, though, and am very pleased with it.
Wiha has a line of heavy-duty and extra-heavy-duty screwdrivers, the latter having the shaft run solid all the way through the handle, having a solid steel striking cap. (As an industrial mechanic, these are awesome to use, though I only use the cap to strike with, not wanting to strike my screwdriver with a hammer, but, you could, with I am sure no damage to the tip whatsoever.)
(Use the insulated ones for electrical work, though. )
Wiha tools are guarranteed, too. Nothing against Klein, I love my Wiha.
Wiha, and several other companies, like http://www.knipex.com make tools that Klien fail to compare to. The notion that Klien is the top end is a farse. Don't get me wrong they make other things outside of pliers and screwdrivers that other companies can not hold a candle to either. But as far as hand tools go, they really haven't kept up with technology for making lighter, stronger more ergonomic tools.
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