I use this for practicing digital patterns e.g. (chordal tones): 1235, 1231, 1212, 123#11, 7 3 13 9, etc. through all keys, increasing speed over time and with different combinations of alterations on each circle.

V7s Circle of Fifths 2 beats per chord - Exercise Practice

Not sure if this is redundant... didn't see it on this thread so thought I'd post. Thanks to all the uploaders!