Sizes and gradations:

Diameter x width x bar	Grads:
10x10x3	60 and 120
15x10x3	120
20x15x6	40
20x20x6	40, 80, 150
30x30x6	40, 80, 150, 240
40x20x6	40, 80, 150, 240
50x30x6	40, 80, 60, 120, 150, 240
60x30x6	40, 80, 150, 240
80x30x6	40, 80, 150, 240