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What is the difference between 9001KR9*, 9001KR9*20 and 9001KR9*21?

What is the difference between 9001KR9⦿, 9001KR9⦿20 and 9001KR9⦿21?

Product Line:
9001 Push Buttons

30 mm Multifunction Operators

The different endings indicate different mushroom operator diameters:
default size is 1"5/8 (40mm)
9*20 = 1"3/8 (35mm)
9*21 = 2"1/4 (57mm)
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