We use 3mm at work all the time. They're hard to find as few people bring them back so I figured I would 'I would buy one to get my job done. My tools have been SAE tools over the years so I didn't have a lot of metric sizes in my box. I really like these bits. They take the torque of a power tool, are not rounded up and last a long time the downside is there are 4 in a box the one I use every day has held up so well I don't understand how to get to the other 3 when I use them I don't lose.Finally I gave one to a colleague of mine after he borrowed mine a couple of times, he likes it a lot too.
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