In this world, the unit is often the source of confusion. Climbing is no exception. As an example, here is an extract from Andy Kirkpatrick's solo attempt in Troll Wall, where he had a hard time as vividly described in his own words:

[After hand-drilling a hole to place a bolt:]

I slid the bolt onto the hanger, then pushed it into the hole, but found it was a little too big to fit easily, so tapped it in with my hammer. I felt it trying to resist, but eventually felt it begin to give way. Then, after only a centimetre, it started to bend.
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