Originally Posted by
wesmamyke
The non metric Blackburn hardware is the most annoying, that stuff is just everywhere in the bolt bins. Metric thread, but they take an American standard allen wrench.
IIRC, those weren't metric thread, but rather SAE 10-32, which is close enough to work in a 5 x 0.8mm hole. And they came with a 1/8" Allen key.