
I bought almost the same set from another seller a few months ago and the M3 tap can't hold tight in the drill chuck. I bought this set on purpose because the pictures show shafts that are too small - I wanted bits with a larger shaft and was less interested in the grip as I already had one. I bought it but so far it's not very reliable in the pen. The two devices I have look the same in every way, so I suspect it's just a matter of poor quality control whoever made them. However, this one advertised Drop Shanks and that's not what you're likely to get. I sharpened the cams on the last one so they were tight enough on the M3 bit and haven't tried threading with this M3 tap but they look the same and the first set cuts very poorly leaving an oversized and loose end cut for both M3 and M4. I suspect this set will yield similarly mediocre or poor results. I haven't tried other sizes as I bought these sets specifically for the M3 and M4 sizes. For needs like mine I cannot recommend this or any of the identical kits sold under half a dozen or more titles here on Revain.

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