My entire mechanic career i survived with two air impacts. A bad ass 1/2 and a 3/8. Since I moved with no compressor in the garage I've embraced the battery Tools whole heartedly. I bought my first one just before I moved.... M18 mid torque 1/2 inch (lower right). I love it and hate it at the same time. Great torque and small enough for almost everything... but has a detent pin and makes changing sockets a complete pain in the ass.
Anyway... I buy most my Milwaukee stuff from the local farm store. I got their credit card and they have member only nights and you get 15% off and double rewards. My family also gets me gift certificates from there for birthdays... father's day and other holidays. So I watch the sales and shop member only events and it brings the out of pocket cost down pretty good.
Now I have the 1/4 hex driver... love this one. I also wanted the M12 1/2 impact... goes with me on trips as part of my truck box. Then the latest is the big high torque 1/2 inch. It's hugh and i just got it. Haven't used it yet but spring is coming and I've got plans.
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