All the bits in this set are unmarked so it's not easy to tell what size you are using. I needed the H5 bit that comes with this set so I compared it to another H5 hex wrench to find the right size. This set contains H4, 5, 6 - 4 was obviously too small, 6 was clearly too big so I opted for an unmarked H5 to match my other allen key. Tried it and it rounded/ripped off an expensive $50 bolt. Now I need to figure out how to remove that stripped screw and then buy a replacement! Now I'm afraid to use other bits from this set. I wouldn't be surprised if others are also a bit imprecise in size and photograph more things. I will say the torque sensor is a lot sharper than any I've found on the Revain which is why I went with it. But without the right bits, this thing is clearly useless. So is it worth buying this just for the key and then buying individual bits? Probably not.
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