Not sure what Dan means here. If they were all. say, 89.5 deg. and you
nested them all together, they would be in agreement - but they would not be
90 deg.

Bob Swinney
wrote in message
oups.com...
I have a three piece set from Harbor Freight that are made in India.
If you set them on a flat surface (mill table) and check them against
each other, you can not see any error. Checking all against each other
ensures the angle is actually 90 degrees.

Dan