Bill Wright used his keyboard to write :
I'm talking about the bog standard things, sometimes called 'choc blocks' or
terminal strips. I much prefer the ones with wire protectors, but they seem
to be rare. I've found them on the Rapid website and the CPC website I've and
bought some. But since they're so much better why don't all terminal blocks
have wire protectors? The cost difference is minimal and they remove the
danger of the screw cutting the wire.

They are horrible things to use, difficult to get the conductors in
place, but even worse when they become distorted once they have been
tightened.